After long hours to downgrade my brand new phone to 1.0.2., activate/jailbreak, run app tapp and successfully unlocking the phone with IPSP the phone does not recognize/read my sim and is requesting activation (invalid sim, blah, blah, blah) -- itunes open with message that says that sim card is not at&t.
How do I make this work now to work with my T-mobile sim ?
Please help with this. Kind of lay, so step-by-step would be greatly appreciated.

Tks !!