The aim of the present dissertation is to comprehensively investigate and gain insights into problematic smartphone use (PSU). Effectively navigating this complex landscape demands clear boundaries between normal smartphone use and problematic smartphone use. To reach the objectives of this dissertation, it is crucial to consider both the benefits and risks associated with smartphone use. On such basis, the primary aim is to uncover the potential factors and etiology contributing to PSU and discern the potential similarities and differences between PSU and the established addiction criteria.