"No Service" on iPhone 3GS since upgrading to OS 4.3.1

I've just upgraded my iphone OS to 4.3.1 & can no longer pick up any signal (locations in London where I have had no problem in the past & other phones are fine), I seen to permanently have the "No Service" message in the top left.
So far I have tried:
switching it on & off
resetting using the sleep & home button
resetting the network settings
restoring from a backup
taking the simcard out & putting it back in again
Nothing has worked so far. As i understand there is no rollback procedure with Apple OS, is there anything else I can try?
Not sure if it makes any difference but I have a Dutch T-mobile simcard but there's never been a problem using it back in London or upgrading in London. Any help appreciated!

I'm having the same problem. The last couple of days my cell service has been weird - I'll make a call and it will immediately fail, for example.
This afternoon I tried to make a call and it tried to connect (start ringing) for a loooooong time. I gave up and my service status went to "Searching..." and stayed that way. I am in an area with full 3G coverage, and our other iPhone (3G) and 2 iPads had full 3G signals. I was able to make a call with the 3G phone so I know it's nota service or signal issue.
A few minutes ago I had full 5 bars but could not place a call. The status just says AT&T, not "3G" like normal. If I try to place a call it just hangs, and doesn't even say anything under the person's name (like where it normally says "calling" or "dialing" or whatever it is). If I cancel it will quickly flash to "calling" then immediately to "cancelled".
This is really weird. Texts will not go through, either.
I'm about to do a restore so hopefully that does the trick. FWIW, the phone is not jailbroken and never has been.

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