My iPhone 4S will no longer connect to wifi. It is on os6. I've had it for 18 months

My iPhone 4S will no longer connect to wifi.  The wifi button is greyed out. It is using io6. Like this for a week . Is 18 months old. what is warranty time in Australia?

There is a one year limited hardware warranty with all iPhones.
You can check your warranty by going to supportprofile.apple.com.
Try to restore the iphone as new without restoring from a backup. If that doesn't work, you're going to need a repair.
And if it's out of warranty, you will have to pay for it.

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