My iPhone Wi-Fi stopped working and I don't know why

I have an iPhone 4s that I bought last November (2012). At my house, as well as my friends' houses I would automatically join their Wi-Fi. Recently my phone stopped letting me join any Wi-Fi networks, and now it doesn't even let me scan for any networks. I will probably have to bring my phone into the apple store but I was hoping somebody had some feedback.

You should bring it to apple. But next time try bestbuy protection on your next device, it's way cheaper anyway.

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