here's a thought: i'm a tmobile customer (no longer under contract) and I'll be purchasing an iphone with a 2 year contract. since there aren't any promotions or discounts regarding iphone, what's stopping me from signing up with At&t today, getting a free POS phone out of a two year agreement, selling it right away on ebay, and buying my iphone friday (or whenever) as an existing At&t customer? might be able to knock $200 off that way! feedback??