Activate factory unlocked iphone 4?

I just recently bought an iPhone 4 that is factory unlocked and now I have to activate it. Can you guys give me step to step details on how I should do this? I tried restoring the phone and setting up it, but every time I put in my t-mobile sim card, I always get a No Service notifcation. Do I restore it with the att sim card OR t-mobile?

Make sure that your phone is really factory unlock because if it is, then you will be able to use it to different network. Try restoring it in itunes or call TMobile so that they can help you activate your phone.

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