Information sharing has been easier as smartphone advances, however the problematic smartphone usage or in this thesis smartphone addiction and cyberloafing are considered as the drawbacks in the advancement itself. Personal traits are also involved in individuals smartphone usage, decision to cyberloaf and lastly the possibility of becoming smartphone addict. The aim of this study is to find the implication of smartphone usage, self-regulation, general self-efficacy. and cyberloafing on smartphone addiction because this type of research is still limited. The purpose of this study is to find the implication between smartphone usage, self-regulation, general self-efficacy, and cyberloafing on smartphone addiction. The primary data was collected through questionnaire distribution and filled by 270 respondents who are active students in Pelita Harapan University with an functioning smartphone. The research was conducted from 18 September to 25 November 2018 Data collective analyzed with SPSS for calculating reliability while SmartPLS 3 was used for Structural Equation Modeling (SEM) for calculating validity and hypothesis testing. On the result of the testing there are a number of findings of this earch namely, research there is a positive influence of smartphone usage to smartphone addiction; self-regulation and smartphone addiction. On the contrary, there are a few hypotheses in this research that are not supported due to the critical value and p-value insignificancy namely self- regulation to cyberloafing, general self-efficacy to cyberloafing, cyberloafing to smartphone addiction. As a suggestion, researcher concluded that it is compulsory for the educational institution to allocate students use of smartphone during class, and to increase student's self-regulation in order to control the rate of smartphone addiction.