My iPhone 4S Wi-Fi does not work after iOS 7.1 upgrade

Hey Friend , I felt big trouble in my iphone 4S . After upgrate IOS 7.1.2 , my iphone 4S does not work WIFI and Bluetooth . Anybody is there who help me how to solve this issue .
al.emran.hossain

iOS: Troubleshooting Wi-Fi networks and connections
iOS: Wi-Fi settings grayed out or dim

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