Phone owners sometimes ask this question. It is easy to answer if you have the necessary program and Android.
In order to determine who and when took your smartphone, you need to install the application WTMP. After installation, grant the application all the necessary permissions and the program will start its work.
Each time the smartphone is unlocked, the program takes a photo on the front camera and records the time. The reports will also show which applications the person who unlocked the phone used.
In the application settings, you can enable the function so that the application takes a photo even if the wrong password is entered.