Using Mobile Phones at Work in Personal and Professional Information Processes

: Employees use mobile phones for several information processes at work, either in relation to their work or their personal life. This study uses descriptive statistics and regression analysis in order to identify which information processes are accessed by employees to reach their personal and professional goals when using mobile phones at work, using a sample of 368 professionals from di ﬀ erent ﬁelds in Romania. The results of the study show that messaging applications (e-mail, sms, Messenger, Whatsapp, etc.) and searches for information on the Internet are the biggest time consumers for personal purposes, while telephone conversations (voice only) and searches for useful information on the Internet are the biggest consumers of working time for professional purposes. Based on the opinions of employees, we found that the most important e ﬀ ect of mobile phone use at work for personal purposes lies in the fact that it helps employees be more productive through a better work–life balance. The mobile phone was originally designed as a personal device, but today, since employers are allowing or requiring its use, during work, it is also used for professional purposes.


Introduction
The mobile phone can generate social capital, leading to economic, social and political opportunities [1]. Geser states that before the appearance of mobile phones, formal organizations had created sophisticated fixed telephone lines specifically for their structural and organizational purposes [2]. Today, mobile phones are substituting most of the fixed phones and are adding new functions for the users, such as activity recognition using cell phone sensors [3].
Information is especially useful for developing and sustaining a company's competitiveness in terms of its products and services on the market [4][5][6]. It is achieved by organizational control of information processes that involve information processing such as the acquisition, recording, organization, retrieval, display, or dissemination of information. Information processes have been considered from the information systems theories perspective. We considered the mobile phone as an instrument used by the individual to perform any generally recognized information processing: collect, organize, analyze, store (and retrieve), transmit (and receive), process and display. According to Encyclopedia Britannica, information processing is considered the acquisition, recording, organization, retrieval, display and dissemination of information [7]. The European Commission provides a definition of information processing as "any operation or set of operations such as collection, recording, organization, structuring, storage, adaptation or alteration, retrieval, consultation, use, disclosure by transmission, dissemination or otherwise making available, alignment or combination, restriction, erasure or destruction" [8] (p. 33). A similar definition of information processes can be extracted from Alter, who defines an information system as "a work system whose processes and activities are devoted to processing information, i.e., capturing, transmitting, storing, retrieving, manipulating, and displaying information" [9] (p. 6).
Smartphones are able to realize any of these information processing types. The focus of human behavior defines the purpose of the information processing, differentiating professional and personal purposes. Hence, this study considers two types of information processes involving the use of mobile phones: personal and professional information processes.
Mobile phones are processing information through different software, accessing many kinds of information from different information channels. Information processes connect the user with these channels by the information transmitted or accessed through them (e.g., information processes appear in the use of e-mail, sms, Messenger, Whatsapp, GPS, Waze, etc.). Therefore, it becomes obvious that information processes cannot be treated separately from their related information channels. Due to their various kind of processed information, different software and diverse information channels, this study considers the different practical use of mobile phones in different information processes: games, getting evidence through audio-video recordings for the work done (only for professional purposes), messaging applications (e-mail, sms, Messenger, Whatsapp, etc.), movies/videos viewing applications, music-listening applications (including on-line radio), online stores, orientation applications (maps, GPS, Waze, etc.), phone calls (voice only), search for useful information on the Internet, social networks (Facebook, Twitter, Instagram, etc.), specialized applications made available by the company, and video calls.
What kind of information processes will bring benefits to companies? Just ones used for professional purposes? Or could even the information processes used by employees for private matters sustain their working tasks? This study puts forward several reasons for using mobile phones for personal information processes at work and also stresses the positive and negative effects of mobile phone use at work for personal purposes. However, enterprises need to learn how information should be used in order to generate profitability and be competitive on the market [4], and how a culture of knowledge sharing could be promoted [10].
Today, mobile phones are replacing computers and are used to call, text, send e-mails, run video conferences, do micro-blogging, interact on social-networks, surf the Internet, watch and share videos and pictures, play video games, and utilize a tremendous array of software-driven applications. The main positive aspects of cell phone use (CPU) reported by other studies comprise the following: • CPU is positively related to anxiety and satisfaction with life [11]; • CPU counts in positive use for organizations as it is important to have knowledge of market and share information and keep in touch with clients and superiors [12,13]; • CPU has positive impact on the experience of work and the ability to effectively solve problems on the spot [12]; • Smartphone promotes autonomy in a workplace, making employees feel better [13].
The main negative aspects to cell phone use (CPU) reported by previous studies include: • CPU disrupts physical activity behaviour, causing high frequency users to be less physically active and more sedentary in comparison to low frequency users [14]; • Smartphone users are obsessed with their smartphones [15]; • CPU is negatively related to academic performance [11]; • CPU in the manufacturing sector may not positively contribute to productivity gains [13]; • CPU dependence on smartphones at work may increase workers' perception of their job performance and workplace social capital; however, on the negative side, it may lead to the emergence of smartphone addiction symptoms [15]; • CPU negatively affects attention as focus is on chatting, listening to music and other activities, while academic activities are neglected and left to suffer [16]; • Excessive use of smartphones separates people from realities [13]; • When employees use their smartphones to work on their projects from their work, sometimes they bring stress from their workplaces into their private lives at home, so they cannot separate their work and non-work lives [13].
Regarding the possible positive or negative influences when using mobile devices at work for personal purposes, in this study we outline the likely effects that may have an impact on individuals and organizations. These effects (either positive or negative) are related to productivity, efficiency, pace of work, work-life balance (WLB), colleagues from work and stress at work. Personal purposes are related to private life: communication with loved ones, interests regarding home-owning or other properties (e.g., car, personal goods, etc.), contact with friends and relatives, and also information regarding friends and relatives. These purposes have nothing to do with work tasks. Professional purposes are related to the work environment: work tasks, working with colleagues, working hours, deadlines for specific activities, etc. These purposes should not be related to personal issues. However, if we take into account that nowadays individuals work long hours every day and private matters are dealt with at the same time (and sometimes it becomes impossible to do so after working hours), then a work-life balance (WLB) is needed. The concept of WLB indicates to what extent the job allows employees to fulfill their personal life needs, considering their working hours. For WLB, mobile devices play a central role since they constantly provide workers with access to information, keeping them in touch with other people.
As these two issues recharge the engines of competitiveness-information and technology (mobile phone, the Internet, etc.), considering the return rates on digital investment [17]-it is important for managers to give proper importance to this mix if they wish to create a business-friendly, sustainable and value-added business.
The mobile phone has become a device that many of us cannot not live without, with many aspects of our daily life being influenced by its use [18]. Data included in the Human Development Index comprise a component on mobile phone subscription per 100 inhabitants, showing that the number of mobile subscriptions per 100 inhabitants in Romania between 2000-2010 grew by approximately 10.54 times, from 11.3 to 119.2, reaching a ratio of more than one subscription per inhabitant [19]. As the percentage of the population using the Internet on various devices grew from 3.6% in 2006 to 59.5% in 2016 [19], we can assume that the lives of Romanian workers have been influenced by the use of mobile phones and by Internet connectivity. Smartphone adoption by workers is similar all over the world; managers are facing the challenge of efficient integration of these new devices into the daily routine of their workers. It has been found that research is needed not only to determine how more mindful usage of technology influences employee engagement and effectiveness, but also to determine how the most effective norms around these practices could be created [20].
Given the large variety of apps available for today's smartphones, it is quite difficult to describe a complete taxonomy of areas in which these devices can be used. According to Yim and Gomez, mobile phones have three major intervention areas [21]:

•
The process of focusing on information, which is connected to occupational practices and widening of knowledge, and enriching them; • Flexibility in life at work.
The focus of our research is on the use of mobile phones at work, its main research question being how mobile phones are used by employees and for which purposes. We investigated several characteristics of the relationship between the use of mobile phones at work and which information processes are accessed by employees for personal and professional purposes, discovering that mobile phone use, as a knowledge-sharing instrument, is an important aspect at work. We consider that today, smartphones are the most used mobile devices on the market. In this study, we have not considered simple mobile phones, with no Internet connection, as nowadays these are rarely used. We also considered that any available use of a mobile phone involves the participation of an individual in an information process, since this device requires the user to acquire, record, organize, retrieve, display or disseminate information in relation to another individual or software. The phone calls, video calls, messaging, or use of any available apps involves the participation of an individual in an information process.

Theoretical Framework and Hypotheses
The access to information by means of smartphones is linked to learning processes. In a study involving students from Jamaica, it was found that when a mobile phone is used as a learning tool, there is pleasure when using it [22]. In addition, a mobile phone becomes an opportunity to rethink the higher education system, with students being always ready to use it in the classrooms for learning [22]. The communication function of these devices has consequences for the use of authority. In some cases, the use of mobile phones leads to the exclusion of authority's delegation to subordinates, as managers are always in touch with what is happening in the company [2], being able to call any subordinate on their mobile phone.
The unlimited access to worldwide sources of information changes the practical perspective of bounded rationality in decision-making. As Bratianu et al. assume, decision-makers should acknowledge the fact that good decisions rely on a manifold approach that simultaneously integrates various types of knowledge, intuition and bounded rationality [23]. From this perspective, the use of mobile phones at work expands the types of knowledge instantly available to a decision-maker, be it internal or external information.
This simple device (mobile phone) can also invade people's personal life. For example, in the case of doctors, who can be called at any time in their leisure moments, mobile phones bring a way for patients to notify them in case of urgent need [2]. Ultimately, a mobile phone is seen on the market as a marketing tool. This is due to the fact that the target audience is directly or indirectly contacted (either by voice calls or by text messages, etc.), based on the information that phone operators already have (age, marital status, occupation, domicile, number of children, etc.) [24].

Knowledge Management through Mobile Phones
The connection of mobile devices with the knowledge management field comes from the fact that the use of mobile phones expands knowledge-sharing [25]. High availability and ease of access, for practically any category of information, are basic conditions for knowledge sharing that are built into mobile phones. Access to social networks is, by its very nature, a knowledge-sharing activity. This wave of change affects the prospects of companies as regards the use of mobile phones in their information systems and knowledge management system. Pitichat states that, "every single company needs to work on a flow of information and knowledge in order to develop their employees to make them more productive" [13] (p. 5). This way, people can share information and knowledge easily for several purposes, whether personal or professional.
The use of smartphones, flows of information and knowledge in and out of an organization, without borders, creates a richer and potentially more effective information environment. Bratianu stresses that knowledge flows from individuals to groups of people and then to the whole organization [26], and, since organizations are open systems, knowledge flows across boundaries towards external business environments.
The adoption of smartphones at work has also been assessed by Ahmed et al. using a Technology Acceptance Model (TAM) [27]. Using this model, the author explains the perceptions of using new technologies, underlining their ease of use and usefulness that, in turn, affects the intention of adopting social media as a tool for knowledge sharing [27]. The TAM model has been widely applied in research on the use of social media for knowledge sharing as a means of looking into different scenarios for knowledge sharing, and for emerging Information Technology (IT) [27].

Differetiating Personal and Professional Information Processes through Mobile Phones
Mobile and smartphones, together with the Internet, digital television, and smart electronics, are new technologies that have brought about new e-business opportunities [28]. For instance, more and more Romanian users are accessing the Internet from their personal mobile phones [28]. This creates new opportunities for doing business in the online environment, removing several costs for companies. Chandramat et al. argue that communication barriers with anyone in the world have disappeared through voice calls, and multimedia messages have become increasingly important, being real engines of growth, alongside classical voice services [29]. In personal life, mobile phones are not only used for communicating with others. Smartphones have reached a much higher degree of utilization through such applications as calendar appointments, social networking, on-line radio, music, and games applications [30].
Problematic smartphone use is facilitated by such characteristics of technology as easy access, the possibility of escaping daily life, being able to remain anonymous online, and the frequency of alerts and messages. Popular apps such as Facebook are designed in such a way that the amount of time people spend on them increases [31]. The time spent each day (on average) at the workplace accessing different information channels has reached 1.55 h on social networking sites, and 1.44 h daily on seeking entertainment on the Internet (e.g., music, movies, videos, etc.), and 1.46 h on knowledge-related sites [32]. Whatsapp is the most used application, followed by Facebook and Gmail [32].
Mobile games are video games played online via a mobile device, being particularly popular when downloaded for free (e.g., "premium game"-games played for free and where customers can pay for extra features), and can be single-player or multiplayer games [33]. Moreover, the social elements of most mobile games are significant features in current digital gaming, as social networking sites (SNSs) are successfully integrated and used across many gaming platforms [34]. Earlier findings suggest smartphone gaming, specifically casual gaming, is one of the main activities users engage in, but it is not the most popular activity, as social networking (i.e., using Facebook) is more prevalent [34]. While games can be used during personal time, we believe that they should not be used during working hours since playing a game requires full visual attention to the game and the periodic use of hands for controlling behaviour in the game. For these reasons, we consider that spending time playing games on the mobile phone is highly unlikely to happen during work. That is why we consider that, in prioritising the time spent on the mobile phone at work, playing games should be one of the last choices-the main choices should be related to work needs, and the use of professional applications. Therefore, the following hypothesis has been formulated:

Hypothesis 1 (H1).
There is a negative correlation between the use of mobile phones in the workplace for professional purposes and the use of game applications.
Even if mobile phones do not bring happiness, a recent study reported all respondents had confirmed that mobile phones make them happier and help them find a job more easily [1]. In another study, Yim and Gomez report that mobile phones helped respondents reduce their transport costs and improve their social relationships [21]. At the same time, mobile phones are more effective as they facilitate better communication for informal groups, beyond any control from organizations [35]. However, given that companies invest in specialized applications for mobile phones (used for professional purposes), Geser agrees that the use of mobile phones at work for personal purposes should be regulated by a constant procedure, which should be controlled [35].
According to Pitichat, there are three directions in the use of smartphones at the workplace: (i) autonomy-many companies have started using a Bring Your Own Device (BYOD) policy that can reduce costs and increase productivity; (ii) relationships-smartphones have been integrated into people's lives. Therefore, it would be counterproductive if companies prohibited employees from bringing their smartphones to work. Although there are some companies that totally prohibit their employees from using their own smartphones at work for security reasons, they provide to their Sustainability 2020, 12, 965 6 of 25 employees a smartphone to be used at work; (iii) knowledge sharing-every single company needs to work on a flow of information and knowledge in order to develop their employees and make them more productive [13]. With the integration of smartphones and social network applications, people can share information and knowledge more easily [13]. Also, the "internal social networks have also experienced a rise in popularity, offering to employees and managers a knowledge-share opportunities and a virtual collaboration platform that keeps e-mail inboxes from being overwhelmed" [13] (p. 5). Companies have specialized applications, such as cloud computing, social-sharing sites like Facebook, video-sharing sites like Youtube, and document-sharing site like GoogleDocs [13].
Considering the benefits for the company, there are several acceptable uses of mobile phones in the workplace. Calling colleagues or partners is a natural use of any phone at the workplace. Text messaging, such as SMS, has been seen for a long time as a feature of mobile phones. However, the smartphone supplements classic mobile phone capabilities with computer capabilities. In order to understand the prevalence of one of the two different uses of smartphones at work, we decided to verify what kind of capability is most often used: the classic mobile phone (represented by calls and messaging) or the computer connected to the Internet. We consider the use of specialized applications made available by the company as most representative of the use of the computer capabilities of smartphones. Therefore, the second hypothesis has been formulated: Hypothesis 2 (H2). Most often, the mobile phone is used for professional purposes in the workplace through specialized applications made available by the company.
The number of outgoing and incoming calls and their duration leads to a considerable amount of time that is lost through cell phone conversations. In this sense, Colbert et al. argue that research is needed to set up rules and practices for using technology at the workplace [20], even if there is a study confirming the discrepancies between what employees declare to be the time spent on phone calls for personal issues, and the real time spent on mobile phone calls [36].
Donya and Kumah reported that 47% of respondents need a mobile phone to carry out their working tasks, and by default, the rest of the 53% of respondents use their mobile phones for other purposes [37]. In another study, more than half of respondents admitted taking their mobile phone with them wherever they went [12]. Moreover, employees are expected at work to undertake individual responsibility concerning the use of their mobile phones for personal purposes, so it is advisable that they use their phones at lunch or tea breaks [12].
As social networks have invaded the virtual environment that employees are logging into every day, managers have begun to think about how these socialization applications should be integrated into the practices of companies [38].
Bakhuisen argues that the main categories of information exchange at the workplace are [39]: • Task information related to tasks at hand, followed by information about the policy and plans of the organization (sharing vertically or top-down); • Management information related to results, indicators, and monitoring (leaders need to know how an organization is performing); • Social information, often given by the human resources department, covering such topics as trainings, pensions, or sick leave.
We should add to this list the information accessed from sources outside the organization, information from open sources or social networks. All these categories of information could be transferred (sent, uploaded or downloaded) using a mobile phone.
In a study conducted by Londhe et al., most respondents reported being compatible with listening to music and radio on their mobile phone at work, claiming it helps them reduce stress at the workplace [1]. At the same time, the use of the mobile phone is associated with a relaxed and positive working environment [1,40]. Similarly, Wahla and Awan underline that the use of mobile phones at the workplace for professional purposes has positive effects: it keeps the workers in touch with their Sustainability 2020, 12, 965 7 of 25 managers and customers, while employees are kept up-to-date with the information on the market [12]. The findings of the same study point out that employees working in services had reported working more efficiently with a mobile phone and, therefore being more efficient [12]. Also, as people are responsible for their use of mobile phones, they do not disturb the work of other colleagues [12].
In addition, the study of Donya and Kumah reported that 26.7% of respondents used their mobile phone extensively to spread information related to working tasks, while 16.7% used their phones less intensely for the same purpose [37]. The same authors also reported that 46.7% of respondents do not use their mobile phone to spread or receive information related to working tasks [37].
According to Wahla and Awan, employees working in production are exposed to risks if they use their mobile phones while working, having a negative impact on their productivity [12]. Also, mobile phones distract the attention of employees and can lead to a lower labour productivity, disturbing the activity of other colleagues [12]. Therefore, it is important for employees to use cell phones only in cases of emergency during working hours, or for a limited time at lunch time or during other breaks [12]. The same authors state that text messages have been preferred by employees as they can hide from supervisors, and the overexploitation of the mobile phones for other than professional purposes should worry managers [12].
Summarising the arguments above, we can conclude that text messaging might be the first choice for using a smartphone for personal purposes for the following reasons: • Employees can hide from supervisors when using their smartphone; • Duration is considerably lower compared to cell phone conversations, with messaging distracting the attention of employees from work for shorter period of time; • Personal interaction is not synchronous, compared to cell phone conversations which require synchronous interaction, giving the worker more freedom of choice as to when to detract attention from work; • Messaging less disturbs the work of other colleagues, compared to phone calls; • Several messaging applications are now available for social media.
Therefore, the following hypothesis has been formulated:

Hypothesis 3 (H3).
Most often, the mobile phone is used for personal purposes in the workplace through messaging applications (e-mail, sms, Messenger, Whatsapp, etc.).
Nowadays, there are more and more discussions related to smartphone addiction [30,[40][41][42][43][44]. In opposition, Ozkan and Solmaz deny this idea, in particular for Generation Z, saying that this generation is not addicted but has a habit of using smartphones as it is something usual [45]. This generation also wants to express its personality through social networks [45]. Kumar and Devi argue that most social media users are part of a homogeneous group, so the financial investments should follow their needs [46]. Finally, Potongsangarun et al. discuss the attitude towards mobile phone networks as being a function depending on three variables: personal factors, behavior and marketing [47]. Tan et al. admit that using mobile phones, and especially their applications, leads to less face to face interaction, and, ultimately, to loneliness [48]. As we can see from the previous arguments, social networks are characterised by a special feature when we look at the information processes. They allow multiple types of knowledge sharing: sharing thoughts, images and music. These networks enable people to express their personality and to feel a sense of group belonging. They create more context for information than simple Internet pages and generate more emotional reactions from users, leading to powerful emotional attractiveness. Compared to Internet pages, used for searching information, which are static and passive informational environments, social networks are vibrant, dynamic, emotional environments. People experience a feeling of connectivity with their friends and acquaintances and, at work, this need for connectivity can enter into conflict with the need to focus attention on the work to be done. In analysing this conflict, we want to see if the propensity of employees to increase the time spent using smartphones at work brings an increase or a decrease in time spent on social networks. A decrease of time spent on social networks, when time spent on smartphone at work increases, will show that some restraining factors are manifested. In accordance to what has been stated above, this study hypothesizes that:

Hypothesis 4 (H4).
There is a positive correlation between the use of mobile phone at the workplace for personal purposes and access to social networks (Facebook, Twitter, Instagram, etc.).

Research Instrument, Data Collection and Sample
The aim of this study is to suggest two regression models to show which information processes are accessed by employees for personal and professional purposes when using mobile phones at work. It is a quantitative research that has been conducted using an online research questionnaire.
The questionnaire comprises 24 questions, with many sub-questions (items) that collected the ratings given by respondents on a 5-point Likert scale (1 = "never"; 5 = "very often" or 1 = "totally agree"; 5 = "totally disagree"), using rating names adapted to each question. Many of the items of this tool are related to information processes and information channels accessed through mobile phones, already discussed in the results of other studies [1,2,13,21,26,30,35,37,40,41,44,49], including perceptions of the behavior of managers related to the use of mobile devices at work, plus personal data covering nationality, age, gender, the highest level of education reached in a specific field. However, as this study focuses only on information processes used at work for personal or professional purposes, the additional collected data will be used in future research.
Along with the demographic variables, the whole questionnaire includes 95 items. The internal consistency of the items was tested only on 40 sub-questions in the questionnaire (those used for the current paper), excluding the items related to demographic variables. The Cronbach's α coefficient of these research sub-questions had a value of 0.868 (details in Table 1), higher than 0.600, which indicates that the internal consistency of the items has been reached. This instrument was pretested at the beginning of July 2018 and was subsequently modified. It was pretested using interviews with 10 specialists in such fields as marketing research, marketing analysis, engineering and education, who provided feedback and ideas for modifying it. The interviews were conducted in order to ensure that the items of the questionnaire are understandable and easy to complete. The participants made improvements, depending on the nature of their experience, both in terms of question formulation, type of variables and statistical analysis. The main improvements that have been made to the questionnaire in the pre-testing phase were: the informational channels were listed in order to clarify the items (for example: messaging applications (E-mail, sms, Messenger, WhatsApp, etc.), social networks (Facebook, Twitter, Instagram, etc.)); a distinction was made between telephone calls (voice only) and video calls (video calls) and the possibility of not using the mobile phone at work at all was also considered.
The questionnaire was distributed by e-mail and on social networks using a message that presented the study's aim, so as to stimulate the curiosity of potential respondents and invite them to take part in Sustainability 2020, 12, 965 9 of 25 the research. The invitation to fill in the questionnaire also contained a questionnaire link, and was sent by the authors of this study. To complete the questionnaire, the respondents needed 15 min.
As all the potential respondents could not be counted (as we used such social networks as Facebook), we have not computed the response rate. Nonetheless, 368 valid responses from professionals working in Romania in different fields of activity were collected online between mid-July and December of 2018, using convenience sampling.

Developed Variables And Models and Calculation Of Information Processes Intensity
The proposed regression models are multiple and linear, which implies that the target link between the variables is proportional, with the occurrence of at least two independent variables. The general form of the multiple linear model is [50] (p. 90) where: In order to design the regression model showing which information processes are accessed by employees for their personal purposes when using mobile phones at work, we have used the dependent variable-use of mobile phone at work for personal purposes (with possible answers "Yes/No")-and the independent variables-games, messaging applications (e-mail, sms, Messenger, Whatsapp, etc.), movies/videos viewing applications, music listening applications (including on-line radio), online stores, orientation applications (maps, GPS, Waze, etc.), phone calls (voice only), search for useful information on the Internet, social networks (Facebook, Twitter, Instagram, etc.), specialized applications made available by the company and video calls (with possible answers the using of these information processes on a scale from 1-minimum to 5-maximum).
For the regression model showing which information processes are accessed by employees for their professional purposes when using mobile phones at work, we have used the dependent variable-use of mobile phone at work for professional purposes (with possible answers "Yes/No")-and the independent variables-games, getting evidence through audio-video recordings for the work done, messaging applications (e-mail, sms, Messenger, Whatsapp, etc.), movies/videos viewing applications, music listening applications (including on-line radio), online stores, orientation applications (maps, GPS, Waze, etc.), phone calls (voice only), search for useful information on the Internet, social networks (Facebook, Twitter, Instagram, etc.), specialized applications made available by the company and video calls (with possible answers the using of these information processes on a scale from 1-minimum to 5-maximum).
The dependent variables for both regression models were simple, in line with the aim of the study to confirm the action of using mobile phone at work for personal and/or professional purposes. As for the independent variables, these consist of the choices of respondents (in a declarative manner) in using mobile phones for specific information processes through their related channels.
We have selected the same independent variables as for dependent variables (the action of using mobile phone at work for personal/professional purposes) in order to maintain data comparability, except one independent variable-getting evidence through audio-video recordings for the work done-which is obviously specific only to professional purposes. To select the independent variables, we took two aspects into account: their discussion in previous studies, and whether they were realistic for the working environment in Romania.
In the analysis, we also have calculated the intensity of the use of information processes (in percentages), which represents an indicator related to the distance between minimum and maximum at which the mean of the use of information processes is located.
Using a scale with responses from 1 (minimum) to 5 (maximum) for using information processes, the distance between extremities is four intervals (therefore, it will result in the denominator value 5 − 1 = 4). To normalize the numerator between 0-4, it is necessary to subtract a point (so it will result in the numerator value mean − 1). Therefore, the following formula was used Intensity of using an informational process P (%) = (Mean for using the informational process P − 1)/(5 − 1) × 100 To present synthetic results other than the regression analysis, we have used specific items and responses in the questionnaire that are described in the results section.

Results
Respondents were asked to specify the percentage of time spent on using mobile phones at the workplace for personal and professional purposes. The results are shown in Table 3. On one hand, 83.15% of respondents declared using mobile phones at work for personal purposes. On the other hand, 16.85% denied it. More specifically, respondents in the second category work mainly in the following areas: public administration, defence and public order, commerce, construction, the manufacturing and extractive industry, engineering, education, health services, financial and insurance services, transport.
Being a fairly wide range of industries, we may consider that the use of mobile phones at work for personal purposes is largely based on individual choice, and is clearly influenced by the personal characteristics of each person [40]. Besides, the Pearson correlation coefficient between the use of mobile phones at work for personal purposes and field of activity (0.037) indicates a weak positive correlation (details in Table A1).
Respondents were also asked if their bosses prohibit and penalize the use of mobile phone for personal purposes during work. The question had five possible answers on a scale from 1-minimum to 5-maximum (1 = "never"; 2 = "rarely"; 3 = "sometimes"; 4 = "very often"; 5 = "always") and the results indicated an average of 1.71 with a standard deviation of 1.02. The distribution of the answers was: 61% never, 16% rarely, 18% sometimes, 3% very often, 2% always. As long as most of the respondents who are part of this research sample declared that their bosses do not prohibit or penalize the use of the mobile phone for personal purposes at work, the present study makes sense for using mobile devices for personal purposes at work.
A total of 68.75% of respondents declared using their mobile phone for work purposes, while 31.25% denied it (details in Table 4). In a further analysis, individuals in the first category are currently working in the following fields of activity: public administration, commerce, information and telecommunications (IT), extractive industry, engineering, education, energy production and distribution, health services, financial and insurance services, shows, cultural and recreational activities, tourism, hotels and restaurants, and other areas. According to the Pearson correlation coefficient (−0.133), there is a weak negative correlation between the field of activity and the use of a mobile phone for professional purposes correlation (details in Table A2). The ability to use phones at work for such purposes depends on company size, company policy, leadership, etc.
Most respondents (32%) reported using mobile phones at work, 80% for professional and 20% for personal purposes. Moreover, 19% admitted the opposite: the mobile phone is used by 20% of respondents for professional and by 80% for personal purposes. Finally, 16% of them use the mobile phone 60% for professional and 40% for personal purposes. Extremities indicate that 12% of respondents use their mobile phone strictly for personal purposes, and only 4% for professional purposes (see details in Figure 1). According to the Pearson correlation coefficient (-0.133), there is a weak negative correlation between the field of activity and the use of a mobile phone for professional purposes correlation (details in Table A2). The ability to use phones at work for such purposes depends on company size, company policy, leadership, etc.
Most respondents (32%) reported using mobile phones at work, 80% for professional and 20% for personal purposes. Moreover, 19% admitted the opposite: the mobile phone is used by 20% of respondents for professional and by 80% for personal purposes. Finally, 16% of them use the mobile phone 60% for professional and 40% for personal purposes. Extremities indicate that 12% of respondents use their mobile phone strictly for personal purposes, and only 4% for professional purposes (see details in Figure 1). It is natural for employees to use their mobile phone, depending on the nature of their work. For example, in the back office, it is normal for financial services to use mobile phone discussions in order to solve specific problems, while in the field of constructions, at the workplace, it is very important for the mobile phone to be used with caution when performing tasks in difficult working conditions. Finally, for the considered sample, the mobile phone shows its functionality, especially from a professional point of view. It is natural for employees to use their mobile phone, depending on the nature of their work. For example, in the back office, it is normal for financial services to use mobile phone discussions in order to solve specific problems, while in the field of constructions, at the workplace, it is very important for the mobile phone to be used with caution when performing tasks in difficult working conditions. Finally, for the considered sample, the mobile phone shows its functionality, especially from a professional point of view.

Personal Use of Mobile Phone in Information Processes at Work
Respondents were asked to tick on a scale from 1 (never) to 5 (very often) how they use the mobile phone for personal purposes at work. This question does not go into personal details (how much time is dedicated to discussions, with whom are the discussions, what kind of information is being searched on the Internet, etc.). Instead, the item provides a global view of the types of information processes that are accessed at work and are not related to working tasks. Table 5 shows the averages for each of the personal information processes taken into consideration and the significant differences between groups, considering the following demographic variables: gender, age and the highest level of education. Most employees use text messaging applications (e-mail, sms, Messenger, Whatsapp, etc.) with an average of 3.59 out of five (intensity of use of 64.75%). The intensity of 64.75% was obtained as follows: (3.59 − 1)/4 × 100. Therefore, hypothesis H3 "Most often, the mobile phone is used for personal purposes in the workplace through messaging applications (e-mail, sms, Messenger, Whatsapp, etc.)" has been validated.
In addition, employees search for useful information on the Internet with an average of 3.43 and a level of intensity of 60.75%. Finally, they use phone calls (voice only) with an average of 3.34 (intensity of use-58.5%). The lowest average was recorded for games: 1.35, with intensity of use of only 8.75%.
The distribution for the considered sample is not normal, so that, in order to test the significant differences between groups considering demographic variables, was used the nonparametric test Kruskal Wallis. With 95% confidence, it can be stated that there are significant differences between males and females regarding the use of games for personal purposes at work. The results indicate significant differences between the considered age groups for personal use of mobile devices at work for: messaging applications (e-mail, sms, Messenger, Whatsapp, etc.), the search for useful information on the Internet, social networks (Facebook, Twitter, Instagram, etc.), music listening applications (including online radio), movies/videos viewing applications, video calls and games. Also, there are significant differences between groups that have different levels of education for personal use of mobile phone at work for movies/videos viewing applications and games.
The first four highest averages indicate that employees want to communicate with other people either through text messages or voice calls. Further, they want to be aware of what is happening outside their working environment, accessing useful information from the Internet, but also by using social networks. While the personal information processes that employees choose at work have previously been reported, the reasons why employees use mobile phones for personal purposes at work are listed below. Respondents were asked to tick on a scale from 1 (totally disagree) to 5 (totally agree) for what reasons they use mobile phone for personal purposes at work (see details in Table 6). The most common reason respondents give for using the mobile phone at work for personal purposes, is the need to know that loved ones are safe. Secondly, the same need for safety is related to personal goods or properties. At the same time, the mobile phone is useful for work-life balance, helping employees schedule their time after work. Again, the need to get information about friends or relatives is important, so employees connect to social networking in order to keep up with the news. All the reasons checked by respondents have an intensity level of over 55%, with an average over 3.20 from 5.
When the mobile phone is used in the workplace for personal purposes, depending on the working conditions (how close employees are working, if there are possible recreational facilities, etc.), individual positive or individual/collective negative effects may occur.
For the results below, respondents were asked to tick on a scale from 1 (totally disagree) to 5 (totally agree) for how they use the mobile phone for personal purposes at work. We considered that using the mobile phone at work for professional purposes is a positive behavior, hence, we asked the respondents only about the positive or negative effects of the personal use of the mobile phone. We developed a scale of answers based on information from the pretesting phase.
The results from Table 7 show an interesting phenomenon: with an average of 3.17 out of 5 (54.25% intensity), employees have agreed that the mobile phone improves their efficiency, while with an average of 2.65 out of 5 (and intensity of 41.25%), they said they work more efficiently when they do not have the mobile phone next to them. Of course, there are many other negative effects that may occur at work when using mobile phone for personal purposes: slowing the pace of work, distracting attention, stress, and even disturbing other colleagues' activities. Finally, the best benefit of using a mobile phone in the workplace for personal purposes is having a work-life balance, resulting in better productivity (with a mean of 3.18 out of 5). The second hypothesis, related to personal purposes, H4 "There is a positive correlation between the use of mobile phone at the workplace for personal purposes and access to social networks (Facebook, Twitter, Instagram, etc.)", has been validated too.
Mobile phone use in the workplace for personal purposes, related to accessing social networks (Facebook, Twitter, Instagram, etc.), is positively and weakly correlated, with a correlation coefficient of 0.386 (details in Table 8). In other words, the more the mobile phone is used at work for personal purposes, the more social networks (Facebook, Twitter, Instagram, etc.) are among the information processes chosen by employees.

Professional Use of Mobile Phones in Information Processes at Work
The other hypothesis is related to professional purposes; H1 "There is a negative correlation between the use of mobile phone in the workplace for professional purposes and games applications" has been validated.
Mobile phone use in the workplace for professional purposes, related to accessing gaming applications, is negatively and very weakly correlated, with a correlation coefficient of −0.044 (details in Table 9). In other words, the more the mobile phone is used in the workplace for professional purposes, the less it will be used for gaming applications. Respondents were asked to tick on a scale from 1 (never) to 5 (very often) what they use the mobile phone for when using it for professional purposes at work. This question does not go into too many professional details, but provides a general view regarding the types of information processes that are accessed at work and are related to the working tasks. Table 10 shows the averages for each of the professional information processes taken into consideration and the significant differences between groups considering the following demographic variables: gender, age and the highest level of education. Most employees use the mobile phone at the working place for phone calls (voice only), with an average of 3.56 out of 5 (an intensity of use of 64%). Moreover, they search for useful information on the Internet, with an average of 2.91 and level of intensity of use of 47.75%. They also use messaging applications (e-mail, sms, Messenger, Whatsapp, etc.) with an average of 2.83 (level of intensity of use of 45.75%). Finally, they use specialized applications, made available by the company, with an average of 2.14 (an intensity of use level of 28.5%). Therefore, hypothesis H2-"Most often, the mobile phone it is used for professional purposes in the workplace through specialized applications made available by the company"-has not been validated.
The lowest average was recorded for games: 1.15, with an intensity of use of only 3.75%. The first four highest averages indicate that employees need to communicate, either through voice calls or text messages, with professionals from the work environment. Also, they need to access useful information from the Internet and use specialized applications made available by the company.
Using the nonparametric test Kruskal Wallis, with 95% confidence, it can be stated that there are significant differences between males and females in personal use of mobile devices at work for: orientation applications (maps, GPS, Waze, etc.) and getting evidence through audio-video recordings for the work done. The results indicate significant differences between the considered age groups for personal use of mobile phones at work for: phone calls (voice only) and messaging applications (e-mail, sms, Messenger, Whatsapp, etc.).

Personal versus Professional Use of Mobile Phone in Information Processes at Work
Taking into account the same types of information processes, we present in Figure 2 a comparison between how often these processes are used for personal and professional purposes.
The biggest difference between the use of mobile phones in personal and professional information processes has been recorded for social networks (Facebook, Twitter, Instagram, etc.), which are most often used by employees for personal purposes. Then, there are big differences for messaging applications (e-mail, sms, Messenger, Whatsapp, etc.) and music listening applications (including on-line radio), which are more often used again for personal aims.
Regarding the specialized applications made available by the company, phone calls (voice only) and video calls, it seems that employees use them more for professional purposes at work. All the rest of the information processes analyzed are more intensely used for personal purposes. groups for personal use of mobile phones at work for: phone calls (voice only) and messaging applications (e-mail, sms, Messenger, Whatsapp, etc.).

Personal versus Professional Use of Mobile Phone in Information Processes at Work
Taking into account the same types of information processes, we present in Figure 2 a comparison between how often these processes are used for personal and professional purposes.

A Model for Personal Use of Mobile Phones at Work and the Information Processes which They are Used for
Using backward regression analysis method, in the first version of the model, the use of the mobile phone in the workplace for personal purposes has been made for all the information processes that appear in the questionnaire (details in Table A3). The final model indicates that the use of a mobile phone for personal purposes at workplace is only for: social networks (Facebook, Twitter, Instagram, etc.), phone calls (voice only) and messaging applications (e-mail, sms, Messenger, Whatsapp, etc.) (details in Table A3). The best version of the model is the eighth, with an adjusted R 2 of 0.186 and an estimated standard error of 0.338 (details in Table A3). For all model variants, p values are 0 (details in Table A4), so the dependent variable are explained by the action of the independent variables. The eighth model has been chosen (details in Tables 11 and A4). Table 11. Regression analysis for personal use of mobile phones at work and the information processes which they are used for. The model for the considered sample (N = 368) for the use of the mobile phone at work for personal purposes has significance levels for the variables less than 0.05 (0.013; 0.000; 0.000; 0.046; −0.055), and is the following:

Model
Using mobile phone at work for personal purposes = 0.500 − 0.048 × phone calls (voice only) + 0.091 × messaging applications + 0.073 × social networks − 0.028 × specialized applications made available by the company (3) The use of mobile phones in the workplace for personal purposes is very low (it achieves a score of 0.5 out of a maximum of 5), when employees do not use the mobile phone at all for: phone calls (voice only), messaging applications, social networking, and specialized applications made available by the company. This mobile phone use for personal purposes increases by 0.588 when employees are using mobile phone for: phone calls (voice only), messaging applications, social networking and specialized applications made available by the company-each of them growing by one unit (0.500 − 0.048 × 1 + 0.091 × 1 + 0.073 × 1 − 0.028 × 1 = 0.588). It is interesting that when employees use their mobile phones for voice calls and specialized applications made available by the company, the general trend of time spent on the phone for personal purposes decreases.
In other words, once personal interests have been resolved by phone calls (voice only) or through specialized applications made available by the company, the time spent on the phone for personal purposes should decrease. The model clearly indicates that the biggest productive time spent for personal purposes appears in messaging applications (e-mails, sms, Messenger, Whatsapp, etc.) and social networks (Facebook, Twitter, Instagram, etc.).

A Model for Professional Use of Mobile Phones at Work and the Information Processes Which They Are used for
The first version of the regression model obtained through the backward method links the use of the mobile phone at the workplace for professional purposes with all the information processes that appear in the questionnaire (details in Table A5). The final model indicates that the use of mobile phones at the workplace for professional purposes is only for: phone calls (voice only), online stores and search for useful information on the Internet (details in Table A5). The optimal version of the model is the tenth, with an adjusted R 2 of 0.331, and an estimated standard error of 0.380 (details in Table A5). For all model variants, p values are 0 (details in Table A6), so the dependent variable are explained by the action of the independent variables. Again, the analysis has confirmed that the tenth model is to be chosen (details in Tables 12 and A6). The model for the considered sample (N = 368) for the use of the mobile phone at work for professional purposes has significance levels for the variables less than 0.05 (0.378, 0.000, 0.001, 0.05), and is the following: Using mobile phone at work for professional purposes = 0.051 + 0.160 × phone calls (voice only) + 0.056 × search for useful information on the Internet − 0.066 × online stores (4) The use of mobile phones at the workplace for professional purposes is very low (with a score of 0.051 out of a maximum of 5), when employees do not use the mobile phone at all for: phone calls (voice only), and to search for useful information on the Internet and online stores. The use of the mobile phone at the workplace for professional purposes increases by 0.201 when the mobile phone is used by employees for: phone calls (voice only), and the search for useful information on the Internet and online stores, with each of them growing by one unit (0.051 + 0.160 × 1 + 0.056 × 1 − 0.066 × 1 = 0.201). As employees use their mobile phone for online stores, the general trend of time spent on the phone for professional purposes decreases.
In other words, once the professional interests of searching for useful information about online stores have been resolved, the time spent on the phone for professional purposes should decrease. The model clearly indicates that the biggest consumers of work time for work purposes are telephone conversations (voice only) and the searches for useful information on the Internet.

Discussion and Conclusions
The use of mobile phones at work has two separate behavioural components. Employees use the devices for several information processes, some being related to work and others to their personal life. Most of them are involved in both personal and professional informational processes, during their working hours. The effects of the use of mobile phones/smartphones at work can be perceived as positive or negative, based on the resulting productivity [40,42]. The time spent on the use of mobile phones at work cannot be implicitly considered a waste. If it is spent on solving personal problems, social networks, personal leisure or comfort-related activities, it reduces working time, thus reducing productivity. However, that time can also be spent for professional purposes, thus having positive effects such as keeping the workers in touch with managers and customers, keeping employees up to date with information on the market and regarding the organizational environment, helping employees quickly access important information from public or specialized sources, using specialized software for doing their work. As our study has shown what information processes people access where they live and work, it contributes to possible future research on social sustainability [51]. We support this aspect, due to the fact that social sustainability promotes well-being at the workplace and information regarding the impact of technology on employees. Since this study shows what personal and professional information processes are accessed by employees at work, the results should be interesting for decision-makers in companies.
The aim of our research was to propose two regression models that capture what information processes are accessed by employees for personal and professional purposes when using the mobile phone at work.
In the first part of the quantitative analysis (mostly with descriptive statistics), we found that only 3% reported not using the mobile phone at work, with 4% using it only for professional purposes, and 12% only for personal purposes (details in Figure 1). Even if the time on the mobile phone is spent for personal interests, the overall effect might still be positive for the organization. We have found that employees reduce their level of stress related to personal issues by staying informed about their loved ones and their goods (see details in Table 6), thus creating a relaxed, less stressful, positive working environment. Results also stress that the biggest difference between the use of personal and professional information processes, in which the mobile phone is used at work, has been recorded for social networks (Facebook, Twitter, Instagram, etc.), which are most often used by employees for personal purposes. The biggest differences in favor of professional purposes have been found in the use of specialized applications made available by the company, phone calls (voice only) and video calls that employees use more for professional purposes at work.
The most unexpected result was the top positions of the two opinions regarding the positive effects of the use of mobile phones during work, with averages higher than the other six negative effects identified (details in Table 7). Employees say the most important effects of using mobile phones for personal interests are that they help them be more productive because they keep their work-life balance, and that phones used in the workplace for personal purposes improve their efficiency. A study based on the opinions of managers might show a different perspective.
The personal use of mobile devices was more intense than the professional use in eight application categories out of eleven, showing an imbalance between the personal and professional use of mobile phones at work (details in Figure 2). Yet, since the mobile phone was originally designed as a personal device, the fact that today it is used in a significant proportion for professional purposes is a beneficial fact, convincing many employers not to prohibit its use during work. Moreover, the study has shown that the possibility of using the mobile phone during working time for personal purposes reduces the stress of the employees related to personal life uncertainties and risks (details in Table 6), and creates a work environment based on trust, leading to increased employee performance.
In the second part of the quantitative analysis, we have analysed the two regression models. Summarizing the findings, the first hypothesis "There is a negative correlation between the use of mobile phone in the workplace for professional purposes and games applications", the third hypothesis "Most often, the mobile phone it is used for personal purposes in the workplace through messaging applications (e-mail, sms, Messenger, Whatsapp, etc.)", and the fourth hypothesis "There is a positive correlation between mobile phone use in the workplace for personal purposes and accessing Social networks (Facebook, Twitter, Instagram, etc.)", have been validated. The second hypothesis-"Most often, the mobile phone is used for professional purposes in the workplace through specialized applications made available by the company"-has not been validated. Both regression models provide empirical evidence for these hypotheses (validated or not): the biggest productive time consumers for personal purposes are messaging applications (e-mail, sms, Messenger, Whatsapp, etc.) and social networks (Facebook, Twitter, Instagram, etc.) and the biggest consumers of work time for work purposes are telephone conversations (voice only) and searches for useful information on the Internet.
Our results proved that preferences for using mobile phones for personal purposes through messaging and social networks (Facebook, Twitter, Instagram, etc.) remain somewhat stable [12,40,45,48]. The on-line stores, orientation applications (maps, GPS, Waze, etc.), music listening applications (including on-line radio), watching movies and videos, video calls and playing games were statistically excluded by the calculated regression model for personal use of mobile phones at work. Also, our study has proven that games are not used on the mobile devices at the workplace for professional purposes [30]. Regarding the use of mobile phones at work for professional purposes through specialized applications made available by the company, there is currently little emphasis on this, although there are opinions arguing that the use of mobile phones at work should be regulated by a constant procedure [35]. The study proved that the use of specialized applications made available by the company leads to a decrease in the time spent for personal purposes, but the regression model for the professional use of the mobile phone didn't reveal a significant impact of this kind of applications. In fact, the specialized applications made available by the company, messaging applications, orientation applications (maps, GPS, Waze, etc.), social networks (Facebook, Twitter, Instagram, etc.), getting evidence through audio-video recordings for the work done, video calls, movies/videos viewing applications, music listening applications (including on-line radio) and games were statistically excluded by the calculated regression model for professional use of mobile phones at work.
We consider that the use of mobile devices at work for personal interests, firstly, through the use of messaging applications, then for searching information on the Internet and, with a lower intensity, for voice-calls (details in Table 5), shows that the length of worktime interruption for the satisfaction of personal interests is important. The employees show they prefer uses that require shorter times, even if this reduces the consistency of the transferred information.
In using mobile devices for professional interests, the order of intensity of use is reversed. On the first place are voice-calls, followed by the search for information on the Internet. The use of messaging applications is in third place (details in Table 10). We consider that this order shows that, in the case of professional use of mobile devices, the quality of the information flow is more important and not the time invested in the transfer process.
Considering the limitations of this study, we must point out that respondents were only from Romania, without using a sampling scheme, hence the results are not relevant for other geographical areas. Yet, given the worldwide behavioral similarities in the use of smart phones, we expect that similar general studies in other countries could show similar results. We collected data on industries in which the respondents work, in order to be able to analyze their diversity, not for a sampling scheme. In the questionnaire, we used the Classification of Activities of the National Romanian Economy [52] to gain a global view of the fields of activities in which employees are currently working (details in Table A7). Hence, the resulting sample has no representativeness for each industry and the number of nominated industries (17) is very high relative to the total number of 368 respondents (with an average of 22 respondents/industry), which shows that no industry is predominant. This paper is limited regarding any influences from different industries on the usage of mobile phones and any significant differences between industries in terms of mobile phone usage. Thus, further research on specific industries might show different results, due to the specificity of potential uses of mobile phones in each industry or even in each type of job. Further lines of research on our topic could concentrate on analyzing the collected data on personal and professional information processes at work, taking into consideration the socio-demographic data of respondents.
Another limitation is the restriction of the applications of mobile phones to a classification of relevant categories, which we used during data collection. This classification covers most of the uses of smartphones but, given the versatility of applications that can be hosted by mobile devices, we cannot claim to have covered all their potential uses.

Conflicts of Interest:
The authors declare no conflicts of interest. Table A1. Pearson coefficient for correlations between personal purposes and field of activity.

Personal purposes
Field of activity Personal purposes 1 0.037 * Field of activity 0.037 * 1 * p < 0.05. Table A2. Pearson coefficient for correlations between professional purposes and field of activity.

Pearson Correlations Coefficient (N = 368)
Professional purposes Field of activity Professional purposes 1 −0.133 * Field of activity −0.133 * 1     Note: * there was used the Classification of Activities in the National Romanian Economy [52].