hey guys, i want an iphone, but am currently on a family plan on tmobile. all i see on ebay are like 700-800 unlocked iphones. i was thinking if this was possible : go to the store, get a new activation for at&t iphone for $199 then cancel the plan after a couple of days, which would cost $175 fee to cancel. total of that would be around $375. is that possible? let me know thanks.