Iphone 4S unlocked but it won't work?

I purchased an unlocked iPhone 4s AT&T its not stolen and it even has warranty but it won't work with Tmobile sim card. Has anyone else had this problem and how did you fix it.

It's not unlocked then. When unlocked, the phone will work with any SIM card including T-Mobile's. You should get it factory unlocked. You can mail this person (arghyle@rocketmail.com) who can help you get your phone factory unlocked.

It may have been unlocked via a jailbreak, and then updated. This would break the unlock. It probably wasn't factory unlocked.

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