IPhone 3GS, doesn't find any network after updating to iOS 4.1

I recently updated my iPhone 3GS, and now I can't find any network. This really bothers me as I need a phone. How can I fix this?

Do the following in the order specified:
1. Power your phone off, wait ~30 seconds, then power it back on. If no change, proceed:
2. Reset your phone: Press the sleep/wake button & home button at the same time, keep pressing until you see the Apple logo, then release(ignore the slide to power off). If no change, proceed:
3. Settings>General>Reset>Reset Network Settings.
If no change after the above, post back.

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IPhone 3GS, doesn't find any network after updating to iOS 4.1

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