IPhone 4 won't recognize Wi-Fi?

Basically a few days ago my iPhone started recognizing Wi-Fi networks. I have tried it at home and with other Wi-Fi networks so I know it is a problem with the phone and not the Wi-Fi network itself. Does anyone know how to fix this so I can connect to my Wi-Fi again?

Added (1). thats *stopped* recognizing Wi-Fi not started… My mistake

Not good.

Mine will. Cut it on and back off.

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