Can i unlock a Sprint iPhone 5?

A friend of mine wants to trade phones for my Samsung galaxy s3 although I'm on AT&T and the iPhone is on Sprint. I want to accept the offer however I don't know if it'll support my network (I am under contract so regardless if I use my phone or not it has to be paid) or if it can be flashed to... show more A friend of mine wants to trade phones for my Samsung galaxy s3 although I'm on AT&T and the iPhone is on Sprint. I want to accept the offer however I don't know if it'll support my network (I am under contract so regardless if I use my phone or not it has to be paid) or if it can be flashed to something else like a prepaid network such as metro or virgin mobile. Help
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