Can I trade in my s4 for an iphone 5s in the middle of a sprint contract?

I really want the iphone 5s but i'm in the middle of a sprint contract. Is it possible I can trade in my s4 for the iphone 5s? What would happen if I do? How much do I have to pay? I have a regular 2yr contract with them that's ending in August of 2015. I don't want to terminate my contract I just want to switch phones.

Ring your network and ask them.

If they agree, you will pay a hefty amount for the new handset.