I just got back from the AT&T store with my finished pre-order. What they did for me was add the data to my moms, and created a new 2-year contract. I paid the $212 with my money, and they told me as soon as I receive the iPhone, call them and they'll switch it over to my account, and revert hers back to normal, so that was my experience in case you are wondering.
Make sure you're an authorized user as well.
Good luck.
Make sure you're an authorized user as well.
Good luck.