IPhone 4s no longer connects to wifi, wifi is greyed, FaceTime no longer works

I have been having issues ever since the iOS 5.1.1 update and I thought with the iOS 6, all these bugs would be fixed. Unfortunately they have not. My iphone's wifi has not worked for several months now. I believe it is the reason my FaceTime no longer works. Weird thing is, is that I can still receive FaceTime calls, but cannot make them myself. The wifi section in settings is greyed and I cannot even switch it back on. It's permanently in the off position. What is going on with my phone . Dissapointed in my Apple product.
PS- We have an Apple wireless home router, top of line, and we have everything Apple in our house specifically to deal with disconnect issues. My iPad works great at home, same with Apple tv. I know it's my phone.

See this: http://support.apple.com/kb/TS1559
If it doesn't help you likely have a hardware failure. As your phone is still in warranty take it to an Apple store. Make an appointment first.

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