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Oct 20, 2015 4:07 AM in response to alfiesmumanddadby Ingo2711,Did you try this?
Check if the issue still exists after each step:
- Make sure you have the latest version of iOS.
- Tap Settings General > Reset > Reset Network Settings. This will reset all network settings, including Bluetooth pairing records, Wi-Fi passwords, VPN, and APN settings.
If you still need help, contact Apple for support and service options.
copied from If Wi-Fi is grayed out or dim on your iPhone, iPad, or iPod touch - Apple Support