How much would i have to pay for the iPhone 5/5S?

If i trade in my iphone 4 (my 2 year contract is up so i'm just paying month to month now)

IPhone 5 is no longer out. The option to replace the iPhone 5 would be the iPhone 5C which is the iPhone 5 with a polycarbonate back casing that comes in a variety of colors. That phone starts at 16GB of memory for $99 and then the iPhone 5S starts out at $199 for 16GB.