Why won't my iPhone connect to Wi-Fi? - 2

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.
And we don't have an apple store here. I got my phone from The Source.

Try taking it to apple or best buy and try their Wi-Fi and if it does the same thing they can fix it, but when you get there and Wi-Fi works it's a problem with the Wi-Fi at home

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