Why does my iPhone 3G refuse to connect to Wi-fi?

My iPhone will not pick-up any wireless networks at all.Just E/3G. When I go into the settings it does the little loading circle thing but wont find any networks that I've been to. Can someone please help???

Have you tried:
Reset
Restart
Reset Network Settings
Restore as "new"
If none of those resolve the issue, that would tend to indicated the Wi-Fi chip has failed.

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