I have a 2nd gen iPhone and a family plan. I just received a 1st gen iPhone that I want to use to replace the second line on our family plan. Can I just take the SIM out of the RAZR and put it into the 1st gen iPhone and then active it through iTunes? I assume that would make the 1st gen iPhone ring with the number that was associated with the RAZR - correct? I'm hoping its this easy and I don't have to go to the AT&T store.