I ordered a iPhone 6 Plus last night on my wife's line using the Next 12 option. I did not have an upgrade available on my line, and she is fine with her current iPhone 5S. Question: When the phone arrives, can I simply pay off the Next and then switch the phone to my line? Or is tied to her line even if I pay it off? I was hoping I could just take it to the AT&T store down the street next Friday, pay off the balance, and then activate it on my line instead. I'm guessing I'll probably have to activate it on her line first, then pay it off, then switch it to my line, then put her old phone back on her line. Does that sound correct?