Can you unlock an iPhone 4s from att for tmobile?

I got an iPhone 4S with iOS 7.0.4 for AT&T and want to use it on T-Mobile. Is there any way to do this with a jailbreak or can I have T-Mobile unlock it for me?

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If you know that it is locked by AT&T, then only AT&T can unlock it for you to make it work on T-Mobile. If you are not the original owner of the iPhone then you won't probably be able to get it unlocked directly through AT&T support, so the only option left is to use a third party service. Keys2iPhone can unlock out of contract iPhones. To check if it is out of contract, go to iPhoneox.com Good luck!