Iphone price if contract not over yet?

I have a question. If you already have a contract, how much would it be to like upgrade phones? Anyway like an EXAMPLE you got an iphone 4 with a two year contract and youve only had the phone two months what would you do if you wanted to get a 5? Would you have to wait or if not would you have to pay 600$ not the 99$ 2year contract price.

I think the best option is to buy an Unlocked iPhone ( contact free ).

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