STMP - Did someone unlock your device? app for iPhone and iPad
With this tool you can see if someone unlocked your device while you left the room.
Instructions:
1. Remember the four-digit number in box 1
2. Leave this app open and lock your device
3. After you unlocked your device look at the four-digit number in box 2. If it is the same number you remembered no one unlocked your device
Its that simple!