My wife is now wanting a 5. I just used her upgrade to get myself a 5, so she would have to use my mom's upgrade (who is NOT in our plan) to get an upgrade. Can AT&T other retail stores (Target/Best Buy) do this with no problem? Don't know if it helps to have a little more background info, but my mom currently has an iphone 4s, and my dad has a basic flip phone. Both of those lines are eligible for an upgrade. Would it be better for my wife to use my mom or dad's upgrade? Thanks in advance!