IPhone 4S running iOS 6 to T-Mobile

[Jrae550]

I just bought an AT&T iPhone 4S running iOS 6. I need to use it with my tmobile service. Is there any way I can do this without jail breaking the device? And if not, are there any reliable jailbreaks out yet for iOS 6?

 

[Applejuiced]

Jailbreaking and unlocking are 2 totally different things.
You need to unlock it in order to use it on an unofficial carrier.
Is it locked to AT&T?