A guy I know has a problem with his Chinese neighbour. His landline rings usually rings between two and three in the morning which wakes him up. It's a flat he's in so I'm guessing the walls must be pretty thin. He's tried to speak to the guy but the guy makes out he can't understand what he's saying. Someone else said there's something you can buy that clips over the landline cable outside that stops the phone ringing. I've never heard of anything like this. Does such a thing exist?