I jailbroke my iPhone 3G (8GB) using the following stuff.
Software : redsn0w_win_0.9.6rc8
Firmware : iPhone1,2_4.2.1_8C148_Restore.ipsw (from Apple)
All went well and I now have iOS 4.2.1 + Cydia installed. But still any of my SIM's don't seem to work. Signal bars are empty and there is no network name next to them
I can't make calls. 
I'm using Windows 7

What went wrong?
Any ideas? 




cuz i have Wifi Router 