My Iphone 3gs says no service/searching. What can I do?

I have a 3gs that has been unlocked. The TMobile sim card is in, but it says searching/no service. The carrier does say TMobile. I went through troubleshooting with TMobile and nothing. IOS is 6.0.1 and baseband is 05.16.08.

First Be 100% the phone is unlocked. Next make sure the sim card is compatible and in good conditions. If it still won't work try toggling airplane mode and/or turning off the phone with the sim. Also try going to another place with good coverage.

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