Unlock/ Jailbreak iPhone 4s?

My ultimate goal is to unlock my iPhone 4s. I have ios 7.0.3. How can I unlock my phone. Its a AT&T phone, and i need it to work for t mobile. I think jail-breaking it would unlock the phone, but i can't find a way to jailbreak it. Or how can i downgrade my ios to 6.1.2, so then i would be able to jailbreak it.

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Hi Unfortunately a jailbreak will not longer unlock your device. In the past they would have done but now they are two different things. If you would like a jailbreak go to www.howtoidevice.com. They have unlocks as well. One of them is free and the others are paid but the paid options are permanent unlocks.

You are out of luck. There's no jailbreak for iOS 7 and you can't downgrade to a lower iOS version.

The best place to check for genuine and as always, free jailbreaks is http://www.isthereajailbreak.com/