If you have to leave your phone somewhere and you want to be sure that no one touches it, why not try Mobile Alarm? It's an alarm system which you can run on your mobile phone which triggers an alarm when the phone is moved.
By transparently using your phone's camera, Mobile Alarm is able to detect movement and emit a deterrent alarm which can only be de-activated by entering a secret password which you will have set previously.
An innovative way to protect your cellphone.
Download Mobile Alarm - Camera controlled 1.1 in