IPhone 3GS cannot access to 3G network after upgrading to OS 5

My iPhone 3GS cannot access the 3G network after upgrading to OS5. I have checked with my operator and shows that their 3G network is working fine. Only cannot access through the phone. When I enable 3G, there will be no service for my phone. Wifi is working fine.
Any idea how to resolve this?

zlwczr wrote:
Thanks, I will try this method. After restore and syn, will it automatically upgrade back to OS5?
No. If you have 5.0.1, then you will get 5.0.1 back. Restoring should still fix it though. I would prefer to have you back up to iCloud, because there are many known issues/errors when trying to restore via iTunes on iOS 5 or later.

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