Buying an iPhone and plan from AT&T, then ditching... Does anyone know if there are any unforeseen charges that will be incurred if a "friend" of mine purchases an iPhone 3GS from AT&T at their introductory rate of $199 for the 16G along with the 2 year contract and data plan and then walks out and just pays the early termination fee of $150 or whatever that is? Do you have to end up paying the full retail price of the phone as well along with the cancellation fee and is there any charge for cancelling the data plan too? My "friend" can't really afford thirty bucks a month in addition to a regular home internet service and they really want an iPhone, but don't want to buy one through a shady source like eBay or one of the other online retailers. My "friend" can unlock the phone themselves.