I was gifted with this phone when my other quit. My caring brother in law checked it all out and set it up for me including registering it (paring the hansets to base) But he uused his base then mailed me the phones. Now i can't set them up as they want to deregister and won't without the base he set them too. (600 miles away) Can you tell me how to fix this. They were already unhooked with battery unplugged for 4 days.