Table 2. Details in smartphone usage behaviors variables.

Primary category	Detailed behaviors
App log	All App Activity logs Including 18 categories of App usage (except games): communication, media player, system, security, social, life, browser, inputting, beautify, reading, map, dictionary, news, money manage, office, photos, health, others Games: All games; Strategy game; Sport game; Intelligence game; Action game; Simulation game; Role playing game; Shooting game The top popular App usage: Tencent QQ; WeChat; RenRen; Sina microblog
GPS service	GPS service usage frequency Users’ daily range of movement according to GPS records
App package	Install/uninstall/replace/change/data clean/all operation frequency
SMS	Message number of all combinations of “sending/receiving messages,” “messages in the morning/afternoon/evening/all day,” “contact person is/isn’t in phone contacts,” a total of 24 features. The percentage of sending in all (received and send) messages
Call	Call number of all combinations of “making/receiving calls,” “calls in the morning/ afternoon/ evening/all day,” “contact person is/isn’t in phone contacts,” a total of 24 features. The percentage of outgoing in all (outgoing and incoming) calls The ratio between all SMS message numbers and all call numbers
Headsets	Headsets usage
Wallpaper	Wallpaper changing
Contacts	Contacts delete/add/all change frequency
Screen	Unlocking screen in the morning/ afternoon/ evening/all day
Charging	Phone charging