Why is my IPhones Wi-Fi not working?

Its greyed out so I can't even turn it off or on. I went on apples page and did what they said to do on there, and it didn't do anything… Its still greyed out… And its making me extremely frustrated because I also don't get very good 3G in my house. Can someone please tell me how I could fix it? Do I need a new phone?
I did this:
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.
(copy & paste from apple) http://support.apple.com/.../kb/ts1559

Sorry take it back to the authorized dealer and get it replace. There's nothing more you can do.

Did you jailbreak the phone? Your Wi-Fi card may be messed