I have an AT&T Family Share plan but I don't think my problem is related to AT&T. Just recently I discovered that when a person is calling my girlfriend's cell number the call is also sent to my cell number. It appears as though iTunes thinks that the two numbers are shared but this is not the case. How do I stop this merging of cell numbers and make each number independent as it should be. This just happened when my girlfriend updated her iPhone Operating System a few days ago.