Can't open WiFi

I can not use the WiFi in my iPhone. It was locked!!!!
And some of my apps can not open at the some time.
I didn't JB,but how come?
Another question is that can I get a new one if something really wrong with
my iPhone.
I just bought it five months ago.
Thank for your reading.

Hello Eslam Hamada,
Thanks for using Apple Support Communities.
For more information on this, take a look at:
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.
Best of luck,
Mario

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        •    Launch Settings app
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    ~~~~~~~~~~~~~~~~~~~~~~~~~
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    http://tabletcrunch.com/2012/10/27/fix-ios-6-wifi-problems-ssid/
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    ~~~~~~~~~~~~~~~~~~~~~~~
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    https://discussions.apple.com/thread/4010130
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    http://support.apple.com/kb/TS1559
    ~~~~~~~~~~~~~~~
    If any of the above solutions work, please post back what solved your problem. It will help others with the same problem.
     Cheers, Tom

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