Hi, at first I wanna say I did use google before posting and nothing worked.

Basically what happend Is I got an iPhone 3g of me mate bought an o2 sim inserted everything worked.. I got home pluged it in the Pc and updated to the 3.1.2 and after that I couldn't find a carrier and got No Service please note that everything worked before the update.

Thanks!

What baseband are you running? Do you know what network the iPhone was originally locked to? o2? AT&T?

My baseband is 05.11.07 and the phone is for o2.
I noticed that if I go to Settings - Carrier, it finds O2 - UK then a tick comes nextto it but I still get no service.. Everything worked before the update...

Any suggestions?

Have you tried to reset network settings? This might help. Especially if you updated to 3.1.2 not restored.

Otherwise, maybe try a restore to 3.1.2 and set the phone up as a new phone.

Well I did restore it and set up as a new phone but no luck! I'll try reset network setting now, by the way have you got icq or msn?

Network Setting reset didn't help it does find carriers and selects o2 uk but no service, I'm wondering maybe that is happening because iPhone gets no reception?

After I select a carrier in carrier selection and then I exit the setting it says something like: the carrier you have selected is no longer avaible.

Bump...
Any info?

Hey Nick, this No service issue seems quite wide spread.
I have the same issue. But the only saving grace is that if you switch off 3G
you can get Edge service. The problem seems to be a 3G connection issue. I have read many similar comments and no solutions. All the obvious resets, re installs etc don't work for me ;-(