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

MY IPHONE 4 HAS DECIDED IT DOESN't WANT TO JOIN MY Wi-Fi, I CLICK ON IT AND NEXT TO THE NETWORK NAME IT JUST HAS THE IPHONE SPINNER LOADER THING, I've TRIED RESETTING NETWORK SETTINGS, FORGOT NETWORK, AND TRIED TURING IT ON AND OFF BUT IT STILL DOESN't WORK ANY Help? I'm RUNNING IOS 6.0.1

Added (1). WILL THIS DELETE ANYTHING?

Reset the phone. Hold power/lock + home button until the phone shuts off and the apple logo comes up.

It's the certain update makes it f up that happened on my iPad

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