Unlocked iPhone 3 not recognizing T-Mobile SIM card?

I unlocked my iPhone using redsn0w and it worked perfectly, but when I put in my SIM card it just says "searching" at the top. I tried using a new SIM and my old one but neither are working (both are from T-Mobile). Should I wait awhile longer or do I need to do something else now?

The 3g doesn't work on tmobile

You need unlock it with ultrasnow.

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