Sim Card Adapter Does Anyone Know The Code To Unlock Nokia N97 Or Where I Can Buy The Sim Card Adapter For It?

Does anyone know the code to unlock Nokia N97 or where I can buy the sim card adapter for it? - sim card adapter

I recently upgraded 3 of my son a contract Nokia N97, but I decided to use the phone, but I'm at T-Mobile, so I need to unlock the phone or at one of these things SIM adapter.

Who knows how and where can I buy the adapter?

Thanks