Why won't my iphone connect to Wi-Fi? - 1

I have an iPhone 4S, it's a year old, and lately I can't get it to connect to Wi-Fi. The connection isn't very good in my house anyway, and the fact that several other electronics use it doesn't help, but the other things(including my moms iPhone) will pick it up, but not mine. When I try to find connections I get a notification saying "Could not scan for wireless networks."
Help?

Added (1). We have three laptops, a desktop, two iPhones and an iPad connected to the Wi-Fi at my house. My phone is the only one that won't connect.

I reset my network settings, which didn't do anything.

Have you tried doing a hard reset? Hold down both buttons until the screen goes black

Try turning the Wi-Fi on your phone than turn your phone off then wait ten minutes then try again hoped that helped!

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