No signal on unlocked iPhone 3G
I have an iPhone 3G iOS running 4.2.1 that I have ran redsn0w 0.9.6rc8 off my Mac to JB. I then ran Ultrasn0w in Cydia and tried to unlock it. All went well, but I am getting either a very low signal or no signal off my new SIM chip.
I am wondering what is happening and how to fix it. Do I have to update my baseband to 06.15.00? Given all the warnings I chose not to. I think my phone didn't need it, my serial number is 88902... So that is the second week of production? I think? and thus no need. But it is useless at this point.
Any advice, help or direction would be greatly appreciated.