Can I unlock my AT&T iPhone 4s to work with Sprint?

Okay, so I bought an iphone 4s with AT&T in February. My mom is thinking about cancelling the plans and paying the fee.So, is it possible that I can ask AT&T to unlock my phone so I can use it on Sprint? By the way it is a world phone so it has GSM/CDMA so yeah it does work. It's running iOS 5.1.1

No. Period. Gsm won't work on Cdma

No it will not work.

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