This makes no sense, Lets say i was to get an iphone 5 keep it for 3-4 months so that is 199$ + 285$ termination fee. that makes around 485 $ , and then sell my iphone 5 for like 515 $. I would make a profit, or is there a 6 months or so no changing carrier clause. ( As i am not an american i don't know how these things work)
If you kept it for 3-4 months you would still have to pay for service during that time, making it not really worth waiting just to pay a lesser termination fee.