Iphone 4 ios 6 Wi-Fi problem?

I upgraded my iPhone and now the Wi-Fi scanner is somehow deficient. My friend who has an ipod touch ios 5 and she can find the public network with strong signals whereas I can't. The network just doesn't even appear at all. It can still connect to home network though, but maybe it's because the phone is very close to the router. Does anyone know how to resolve this?

Take it to the Geniuss Bar at an Apple Store.

Wi-Fi greys out is now a common issue for those who have upgraded their iPhone to iOS 6. What you can do is upgrade your device to iOS 6.0.1. Apple released iOS 6.0.1 with the fix for Wi-Fi issues.

If you are still experiencing Wi-Fi problems there are some possible fixes that are mentioned in below resource

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