gsm no longer registers on 2008.8

[tim]

Hiya

I haven't been able to make calls for a day or so under asu, I'm getting 
"not registered" when I try and dial 121 (vodafone voicemail) from the 
dialer app. It worked for a while after I installed 2008.8, I'm not sure 
what I've done to it.

What to do?

I could always reflash if I've done something wrong, but it'd be nice to 
at least figure out what went wrong first, or am I wasting my time?

The sim is still working in my sony ericsson.

Thanks

Tim Abell