While gluing it to your hand may be one surefire way to prevent your mobile phone being stolen, surely the most effective anti-theft strategy would be to make the device as unattractive as possible to potential thieves. By this we don’t mean putting a picture of Donald Trump on your home screen or smearing it in a foul-smelling substance. We’re talking about the kill switch – technology that allows a stolen phone to be rendered useless from a remote location by the phone’s owner or carrier.