Purpose: Smartphones have numerous known benefits and can make everyday life easier. However, constant use can have detrimental effects. Several factors play a role in the development of problematic smartphone use (PSU), including usage time, frequency and type, and social media engagement. The aim of the present study was to examine the role of usage time and type in the development of PSU. Materials/Methods: An online survey was completed by 427 young adult university students to assess smartphone use and PSU measured by the Smartphone Addiction Scale . Short Version. Gender, age, and usage time and type were examined as independent predictors, and the predictive power of usage time and type in PSU was tested in age- and gender-adjusted models. Results: Female gender, younger age, estimated usage time, .4 h/day of usage time, and type of use were found to be significant independent predictors of PSU. Based on the age- and gender-adjusted models, heavy process use increases PSU by 7.36 points, while a one-unit increase in usage time increases the level of PSU by 2.75 points. Conclusion: Young adults are the most active users of smartphones and are almost entirely reliant on them in all areas of their lives. In the present study, female gender, younger age, heavy process use, and excessive usage time increased PSU. The results show that in order to reduce PSU, it is important to focus on the context in which smartphones are used and the types of usage, as well as to examine individual differences among users.  Kulcsszavak: social use, process use, usage time, problematic smartphone use, university students