Find your lost or stolen phone, auto enable GPS(rooted phones), make it ring, remotely lock, remotely wipe, take a picture of the thief, hide the app, know with whom the thief is speaking!

We know that pilfering goes on.

That mythical ring gave its owner the power of invisibility, and Plato observed that even a habitually just man who possessed such a ring would become a thief, knowing that he couldn't be caught.