How to unlock sprint 4s to t-mobile?

I want to know how to unlock an iphone 4s thats with sprint to work with tmobile. Don't say its not possible because it is. When I had ios 6 my ex got it unlocked for T-Mobile. When I updated to ios 7, the phone went back to sprint, now I can't use it. I have a gpp sim. I just need a way to unlock it again on my laptop maybe? Even if I gotta go ack to ios 6. (not a big fan of ios 7) please help!

You can't. The phone will only work under the Sprint network.

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