Is there a way to see who has been going through a smartphone (LG2) without your permission? An app? A feature I'm not aware of? My phone is already locked and I'm not interested in changing my pin number.
No. Most apps which do what you want will only take a photo when someone enters an incorrect unlock code. If they have your current code, this would not help you.
CM Locker (Secure & Boost) - Android Apps on Google Play
Hidden Eye: Catch your friends - Android Apps on Google Play
Lockwatch - Protect Your Phone - Android Apps on Google Play
