NEED HELP!!!

I downloaded ITUNES 11.1 and conected my Jailbroken Iphone 3g. It allowed me to upgrade to IOS 4.2.1 however it resetted the phone to factory settings locking it out.

I subsequently downloaded the Firmware 1,2_4.2.1_8C148 and redsnow 0.9.6B5 using baseband 0.6.15.00. I followed the installation instructions and the phone accepted the jailbreak.

PROBLEM:

The phone works with WIFI, accepted the sim code unlock however it does not receive any signal from the Cell company and say "NO SERVICE" Have I done something wrong here and what can be done?

THanks

My email: [email protected]