IPhone 3G doesn't connect to carrier anymore after upgrade to iOS 4.02

Hi guys, I just upgraded my iPhone 3G from iOS 4 to iOS 4.02, but after the upgrade, I can't phone anymore because the telephone doesn't connect to my phone carrier anymore.
Everything else seems to work fine, but I got a continuous "searching..." message at the top left of the screen. Furthermore, when I open settings, I can't see phone settings anymore.
Is this a known issue? Has anyone advices on how to fix it? Do you think a restore could fix the problem?
Thanks a lot.

I have the same problem! Cant access settings, and no MMS. Can I please get some help?

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Hi,
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