Iphone 4 won't connect to any Wi-Fi spots?

Since the iOS 7 update my iphone won't connect to any Wi-Fi spots. I tried resetting the network settings i don't know how many times, reset the phone and tried forgetting networks will not connect can anyone help me? Also it's not just at my house because I couldn't get it at a friends house.

Ahh… Someone with the same problem… Hmm.
This happened to my HTC Windows phone as well. It happens only in the Summer for me, so i'm guessing it has to do with the heat, or if it was windy, all phone, wireless signals are off.
Maybe your phone connectivity signal isn't as strong as your computer's?
This happened to my DSiXL as well, and it wouldn't work, and my warranty had ended from Nintendo, so I didn't try it for a month, and if worked when i tried it. Hope this helped!

Maybe cool your house, or restart the phone again, funky stuff work.

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