Anybody suggest me, what is Android Device Manager? & what is the purpose of using Android Device Manager...
Android has a great native tool to help locate and remote wipe a lost or stolen phone. It's called Android Device Manager, and all you need is a Google account to set it up on your phone, and you can use any other online device to track it down or wipe it. The important thing, though, is that you need to have it set up and ready before anything bad happens.