I've been jailbreaking and unlocking my iPhone 2G since it came out in the UK and have had no problems up till now.
I was running 2.2.1 last week on a T-Mobile (UK) SIM and suddenly my reception changed to 'No service'.
I have since redsn0wed on both (numerous times) Mac and PC successfully but I'm still getting the 'No service' error.
When I go to: Settings>General>About>Network it says 'Phone not allowed'.
I've also tried an 02 simplicity SIM and an Optus (Autralia) SIM with the same results.
In that time I have redsnowedd 2 of my mates 2G iPhones and ultrasn0wed a 3G iPhone successfully with no problem at all.
I also thought that somehow there was an IMEI block on my phone from the network provider. I called 02 and confirmed that my phone has no lock.
I've done a lot of surfing and there doesn't seem to be much on this issue.
Closest thing I can find is that the comm board is damaged???
Any suggestions ?