anyone know if my pre-approved credit from AT&T can be used at another AT&T location, or even at an Apple store? or must I go to the same AT&T store that i got approval at? i do have the credit reference code number given to me by the AT&T rep at the store i went to. i am asking in terms of strategy in case the store i plan to go to runs out of phones (which i do not anticipate happening); i do have 6 other AT&T stores and an Apple store within 10 miles of me i can go to just in case. last year for the first launch how did this work?