How much would it cost to upgrade an iPhone 4S to 5s before my expired contract?

I really need a 4g device and apple and iPhones are down my alley. But I believe I have a 2 year contract on my current 3G iPhone 4. What will the total cost be to switch over? *lets say I can get the 5s for $200.00

The contact is for the service, not the phone. If you got the phone as a deal with a 2 year contract, it does not mean you have to use that phone for 2 years. It only means that you have to stay with that company for 2 years. You can use any phone you want, though. So the cost to change phones (assuming you stay with the same carrier) is the cost of the new phone.

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