Can a US Cellular Phone (S3) be unlocked for use on a Sprint network?

My phone shattered and a friend has a brand new US Cellular SIII to give me. I have the Sprint network. Is unlocking possible?

via Forums de téléphone cellulaire (en français) http://cellphoneforums.net/fr/us-cellular/t363926-can-a-us-cellular-phone-s3-be-unlocked-for-use-on-a-sprint-network.html