My iphone 4s has a greyed out no wi-fi?

I own an updated iOS 5.1.1 iPhone 4s. Just yesterday it wouldn't connect to my friend's Wi-Fi. Now it won't connect to any Wi-Fi and just says "No Wi-Fi" and also won't let me click on it at all. I've tried resetting my network settings, resetting all of my settings, and even resetting with the home button and hold button.

Hmm sounds to me like you don't have Wi-Fi

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