The advancement of the personal mobile devices has given employees the opportunity to use these devices for non-work-related activities which poses a new threat to companies. Hence, this study investigates the level and determinants of personal Internet use using personal devices among Malaysian employees. A total of 200 questionnaires were distributed to 12 organisations in Melaka and Kuala Lumpur. Results of this study indicate that habit and external locus of control are predictors of personal Internet use. The paper presents empirical data of individual and situational-related variables predicting personal Internet use among employees from the perspective of personal mobile devices