I pre-ordered my 32GB White iPhone 4S yesterday but on second thought I really think I want a 64GB model. I pre-ordered through AT&T's website. I also added a new line to an existing plan to get the upgrade price for this phone. When I get the phone could I bring it to an AT&T store, return it, and get a new 64GB iPhone 4S for $399? Also, I didn't pay for this phone. I had the owner of the plan pay for me and I planned to reimburse him. When I return the 4S could I have the money transferred back to his bank account without him actually being there? I know at some stores like Best Buy they just return the money to the account that paid for it.