Does At&t have a trade in service?

I'm thinking of switching to At&t as my wireless carrier and I would like to know if they offer a trade in service. I was currently with Sprint and I have an iPhone 4S in great condition. It has never been cracked or damaged. I would like to know if they would let me trade it in for an iPhone 5 32GB. Someone please help. I also want to know how much value will my 4S be be valued as with at&t?

They do…

https://tradein-program.att.com/home.php5?c=en-us

get the value NOW… Well not now cause you have no current ATT phone number… But use this, get a ATT number, fill out the form, and get ATT's trade in reward quote on a "Apple Iphone 4s 16GB model-Sprint", as they call it…

I forgot to add… You can't trade it in and expect a reducd price on a Iphone 5… No! You with pay $299 for the 32GB iphone 5… And you will like it and deal with it… Then once you got the ATT phone number, fill out the form above along with the old iphone 4s… Then in 4-8 weeks you will get a VISA prepaid credit card with the reward trade in value of your iphone 4s on it… Good whereever VISA is excepted… So… In the long run of 4-8 weeks… The iphone 5 had a reduced price… LMAO!