How to make att to unlock my iPhone 4s which I bought in Craigslist?

I want to unlock my iPhone 4s for Tmobile and I was wondering how can I make AT&T unlock it without ever having a AT&T account. Can you please help me! I bought the iPhone off Craigslist.

Unlockatt.com does it fast! They did my gfs phone

Just call them to unlock it.

Try the top link first.
Hope I helped.

No way AT&T's gonna unlock your iPhone. Check online for factory unlocking iPhone 4S service.

It's possible to get a factory (official carrier granted) unlock unless your iPhone is blacklisted or associated with an AT&T account in debt here: http://www.fastgsm.com/en/apple/apple/iphone-4s/unlock

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