I am looking to buy the iPhone 4 at RadioShack due to the trade in program with the older iPhones. However, I'm on an AT&T small business contract, and I know that Best Buy for example is not able to work on these accounts in store; they refer you to an actual AT&T retail store. Does anyone have experience with Radio Shack who is on a small business wireless account? I really don't want to have to go to an AT&T store, because I won't be able to do the iPhone trade in.