Guardian

Guardian is an app to monitor your phone while you cannot see it, and it will alert you if anybody touches your phone.

Extremely easy to use, just tell Guardian that keep an eye on you smartphone, to be complete sure your phone will be watched.

You can configure which action do when Guardian detects any intruder, like protect your phone by requesting a password, for example.

Other options are available, like activate Guardian by an NFC tag or tell the app say something for when somebody touches your phone like: "Don't eat me, I have a wife and kids! Eat them!".