My Wifi Stopped working automatically after upgrading iOS 7 in my Iphone 4S ??

Hiii....
I upgraded my Iphone 4S but my wifi is not working... Please help me to fix it.

Hi there, this has been happening to a lot of at&t's iPhone 4s.  A good friend of mine had lost his wifi before the update and he tried all the tips; hard reset, freezer for 1/2 hour, etc, one time hard reset worked for all if two minutes.  He went to Apple store to find out he was out of warranty and that he should take up with the carrier ..... Long short at & t had just got news of an update ( one you just did) that would be addressing the "wifi " problems etc . So he waited and as promised two days later update came and no fix... So he took phone to repair place and orig was some kinda fuse that was needed. , under 40 repair but then got a call that a small circuit  board (not positive of exact part)had been compromised and needs replacement part BUT that the repair would be more $ and guess what , the part is on back order ,come to find out that since the last update a lot of 4s owners have been encountering exact same problems that you listed and that it appears to be something to do with update and that apple may be addressing the issue?  My sons 4s with sprint same thing, no wifi and he being told it is hardware issues and his ph 14 mo old and he got so mad he went and bought a new one due to time it would take for repair!? Sorry to say we have yet to actually find a quick let alone easy fix! 

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