So yesterday I got 2 5S grey phones for my son and I at the AT&T store for 449 each . Now my daughter really liked the 5c in pink of course and she has a white 5. Now none of my lines has a full upgrade but I was thinking if I bought straight out a unlocked 5c for full price of 549.00 sell her 5 for lets say 450.00 than its a hundred dollar swing. Could I just walk into AT&T and just switch the numbers for her existing phone number. Or is there some upgrade fee they would nail me with. Or I thought could I not just switch the SIM cards from the 5 to the 5c restore a backup and she is good to go for a 100 bucks extra. Also even at 23 she has been known to drop her phone on several occasions and maybe the 5c given the polycarbonate would be a better oh **** I dropped my phone unit. So what's a good plan of attack and are those SIM cards the same ---------- Also my wife and her assistant are thinking the same thing.