Resetting your Android phone to its factory defaults is a process normally performed from the phone's operating system. However, if your device is lost or stolen, you can perform the same process directly through your Web browser. Android's online Device Manager provides you with the tools you need to find, lock and erase your Android remotely, though it will only work if it has been enabled.
Video of the Day
Point your browser to "google.com/android/devicemanager."
Provide your Google login details. Your Android device must be synced with your Google account for the device manager to function.
Accept the terms of the agreement and wait for Google to locate your phone. Once the device is located, click "Enable Lock & Erase."
Click "Erase" to start the remote reset, and then click "Erase" again to confirm the command. This command is permanent and cannot be undone.