For locking device automatically by sending a simple SMS with the message it's also requires that One click for turn off your device screen and lock device without pressing power button. it's need to received a special SMS which you set as a default. only receiving this special SMS from a specific mobile number your device locking mechanism will be activated and at the moment lock you device remotely otherwise it's not to work..for this we need 2 permission. (1) Device Administrator Privilege t