so i preorderd a 16gb but now i thought about it and want a 32gb. ATT says i can't modify order. They would have to cancel original order and place a new order for the 32gb and prob wont get it not until July . My question is if i use the 16gb can i just goto an ATT store and exchange my 16gb for a 32gb and pay the difference within the 30 day buyer remorse policy? Opinions and suggestion are welcomed!!