My iphone 4s wifi iz not working after upgrading to ios 7.1

any sugestions ???

We need more info to troubleshoot. What do you mean by "not working?" Wireless switch is on? Home router or public networks? Please be more detailed in describing your issues.

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    Added more info ~ 

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    I HAVE FOUND A FIX FOR THIS PROBLEM AND HOPE IT WORKS FOR ALL OF YOU
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    STEP 1 : CREATE AN AD-HOC NETWORK IN YOUR COMPUTER... GO TO THIS LINK http://windows.microsoft.com/en-US/windows-vista/Set-up-a-computer-to-computer-a d-hoc-network
    STEP 2: ASSIGN A NAME AND MARK SECURITY AS NONE ,BECAUSE WE NEED A OPEN AD-HOC NETWORK
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    STEP 5 :TYPE THE NAME OF THE AD HOC NETWORK WHICH YOU ASSIGNED AND CLICK CONNECT
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    STEP 7: REPEAT THIS STEP TWO TO THREE TIMES AND TO THREE TIMES AND YOU SHOULD SEE THAT YOU ARE CONNECTED TO YOUR AD HOC NETWORK
    STEP 8 : AFTER THIS DISCONNECT AD HOC NETWORK FROM YOUR WINDOWS COMPUTER AND THEN SCAN FOR OTHER NETWORKS ON YOUR IPHONE 4S .......VOLA!!!!!...ALL NETWORKS NOW POP UP...!!!
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