the phone is working perfectly. its running 3.0 unlocked. not goiong to update to 3.1. i bought it software unlocked without the original sim. its just the itunes that doesnt accept it. im trying to find a way to use this in itunes as well. right now when i connect to itunes it give me the invalid sim card error.

can anybody help me re-activate the iphone 3gs in itunes ? it doesnt work in itunes and i dont have the original sim of the phone. when i connect to itunes it tells me invalid sim card for carrier. is there anyway to do this without restoring 3.0 firmware ? because i am not eligible to do that. and i also dont have the files stored on cydia. the phone is jailbroken and unlocked with ultrasn0w. thanks for any help