You might see the following when you tap Settings > Wi-Fi.
If this occurs, your device won't respond when you try to turn Wi-Fi on. If you're using iOS 7.1, "Wi-Fi Not Available" might appear in Control Center.
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.