Phone company repairmen can enter a number, then hang up and that same phone will then ring. This is a way to check a line and to check the loudness of the ring! It's a way to call yourself. Does anyone know that number? I need to help a shutin find a phone which rings loud enough so that he can hear it and it would help to be able to call his phone FROM his phone. Do I make myself clear? I sure hope so!