Can you unlock an iphone 4s from sprint to t mobile?

I'm wondering if you can unlock an iphone 4s from sprint to t mobile? Cause that's what i'm trying to do?

I believe you can, although I'm not sure how to unlock phones yet. Go on Craigslist, I know a bunch of people on there know how to do it. They will charge though, but I'd say its worth it: p

Can be done - check kijiji