Factory Unlocked but No Service: iPhone 4?

Here's my specs…
iPhone 4 (AT&T) - 16GB
iOS @ 5.1.1
Untethered Jailbreak
I brought my iPhone 4 to my favorite Unlocker and he "Factory Unlocked" my iPhone 4. I picked it up the next day, and I inserted my T-Mobile SIM Card (which size IS correct) and the iPhone says "No Service". I hear many things such as restoring the iPhone and such, but wouldn't that ruin the jailbreak and get rid of the unlock?
If you know what to do, can you please tell me with a good description?

You need to restore your phone off itunes, sorry it's the only way. Once it's done, unplug the phone, then insert an ATT sim, then plug the phone back in so itunes can activate it. You should get a message saying that the phone has been unlocked. After that you should be good to go.

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