IPhone 3G 2.1 update...Wi-Fi no longer working

Just upgraded to 2.1 and Wi-Fi doesn't work on my iPhone. Before it synced perfectly with my Time Capsule. Now the Wi-Fi menu option in Settings is grayed out with the words "No Wi-Fi" to the right-hand side. I can't even get into the Wi-Fi settings menu to search for networks.
Anybody else got this problem/ have a solution?

I wished thought of that myself! Rebooted the iPhone and it now works fine.
Thanks!

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IPhone 3G 2.1 update...Wi-Fi no longer working

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