How much will it cost for an iPhone 4s?

I'm planning on buying a 16gb iPhone 4s for myself, but I'm curious as to how much it will cost for a 2 year plan and also the monthly cost if I want unlimited texting. Can someone help me out here?

I think it will be 100 dollars or free if you get contract, the iphone 4 is free with contract

It depends on which carrier you buy it on & the options you take when buying it as well as how you use it in the month's time.