TS1559 My Iphone 4S with the latest software, wifi setting is grayed out. Could not be resolved even after restore software in Itune.

My Iphone4S wifi setting was grayed off and could not set wifi on even after I have reset network setting and also restore software from Itune.

Hi YKLeong,
Thanks for visiting Apple Support Communities.
It sounds like you may have tried all the steps in the article below. If your wi-fi setting is still grayed out after trying the steps, the article suggests contacting Apple support for help with your iPhone hardware:
iOS: Wi-Fi settings grayed out or dim
http://support.apple.com/kb/ts1559
Follow these steps to resolve the issue:
Verify that airplane mode is off by tapping Settings > Airplane Mode.
Reset the network settings by tapping Settings > General > Reset > Reset Network Settings.
Note: This will reset all network settings, including Bluetooth pairing records, Wi-Fi passwords, VPN, and APN settings.
Ensure that your device is using the latest software. To do so, connect your device to your computer and check for updates in iTunes.
If your issue is still unresolved, perform a software restore in iTunes.
Additional Information
If you are still unable to turn Wi-Fi on, please contact Apple for support and service options.
If you need to contact Apple, clicking the link above should take you to the right options for your region.
Best Regards,
Jeremy

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