Hi this is ted the real reason it goes the screen goes black is that all new phones are built to to have the camera lens come on and snap a photo. Of the user when you use the phone if you cover or tape the camera lens the phone wont work right.like i saidthe phone makers are require by the gov. To do this that way if someone or you calls a terrorist or lest say a terrorist act they will have a photo of that person so dont cover your lenz or it wont WORK properly