Can I trade in my iPhone 5 for?

Can I trade in my iPhone 5 for a iPhone 4S for free while still on contract? It's in perfect condition but it uses so much more data than my old iPhone 4 and I just can't afford it considering I do not have Wi-Fi at home. I'm wanting to trade it in for a iPhone 4S if possible. Can I? Or am I just going to have to find someone to trade with me?

Find someone. Try craigslist barter section

Not sure.
but if you in PA email me i can trade a 4s and a 4 for it

If you trade be smart about it… The iphone 5 is worth easily 200 dollars more than the 4s used

Why would you trade down?