Why do smartphone users hesitate to delete unused apps?

The process of installing and removing smartphone apps is simple, but choosing which apps to install or remove requires users' time and effort because users need to categorize and think about which apps they will still use and not use based on their memory and behavior. Although there have been several studies on app recommendation, there is relatively a sparse understanding on what motivates users to take an action to delete apps which they no longer use. In this study, we aim to investigate (1) whether users feel necessary to remove smartphone apps. If so, (2) why, when users make a decision to delete installed apps, and which types of apps are deleted. Also, we suggest (3) five categories of burdens that smartphone users may feel when they attempt to delete their installed apps. Finally, this paper suggests how to automate and develop a system of smartphone app removal.