I did this many times before with no problems. I cant seem to get this to work. Here is my problem.

I have a 2g iphone. I restored with a 3.0 ipsw and used redsn0w to unlock and jailbreak. All went well.
However, when I put in my TMOBILE sim card it reads no service. I might get 1 line for a few seconds and then it dissapears. I did this many times before with no problems.

Any suggestions would be appreciated. Also how can I restore to factory setting and delete bootneuter and restore the baseband and everything else to factory setting so I can try again. I know there is more to this then restoring in itunes, I also need to restore the bootneuter.

Please help!!! thank you