1. Lock screen message
If you lose your phone which has been locked by graphics, only you know the code. Using one of Android’s new features, you can now leave an onscreen message asking your phone to be returned. Just go to settings-lock screen and security-lock screen signature. Write a backup phone number and an email message and you’re done.
2. Smartphone return option
Even if the lock screen message doesn’t do the trick, you can use an anti-theft app like Cerberus which takes pictures and even activates a mic. It can block your phone or delete all data on it. The app also locates the phone through GPS and emits a huge voice signal to attract attention.