There is a known problem, I got hit with today already. After changing phone numbers FaceTime would only work (incoming) on the old number. It is a known issue and a easy fix. Turn off FaceTime then back on then go to settings and do a reset. Cleared up my problem just like that. I figure there will be lots of number swapping and this will help you from being as frustrated as I was. I was dreading another call to a CSR then found the answer.