The wi-Fi button on my IPhone 4S is greyed out and will not turn on and therefore I am not able to receive wi-fi.  How can I fix this problem?

The wi-Fi button on my IPhone 4S is greyed out and will not turn on and therefore I am not able to receive wi-fi.  How can I fix this problem?

Follow the steps in the article below to try and resolve the issue:
iOS: Wi-Fi settings grayed out or dim
If after all the steps the issue remains I'd suggest to book an appointment at an Apple Retail Store to have your iPhone evaluated or contact AppleCare for assistance.
Hope this helps

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