Why can I not turn my wifi on or off it's just gray

Can you help

Hi Flozzey,
Welcome to the Apple Support Communities!
I understand that you cannot turn on Wi-Fi on your iPhone 4s because it is grayed out. Please follow the steps in the following article to get this resolved.
iOS: Wi-Fi settings grayed out or dim
http://support.apple.com/kb/ts1559
Resolution
Follow these steps to resolve the issue:
Restart your iOS device.
Make sure that airplane mode is off by tapping Settings > Airplane Mode.
Reset the network settings by tapping Settings > General > Reset > Reset Network Settings.
This will reset all network settings, including Bluetooth pairing records, Wi-Fi passwords, VPN, and APN settings.
Make sure that your device is using the latest software. To do so, connect your device to your computer and check for updates in iTunes.
If you still can't turn Wi-Fi on, please contact Apple for support and service options. If you can turn Wi-Fi on but are experiencing other issues with Wi-Fi, see how to resolve those Wi-Fi issues.
If you go through all of the steps above it may be necessary for you to follow the link under number 4 and contact Apple Support.
I hope this helps,   
-Joe

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