HT4623 can't turn wifi on!! iphone4s HEELPPP!

Hi all
I'm new to this support, right i,m running the new software (updated about 4/5mths ago), the other week i had to do a hard reset on it for some reason, then after that found that wifi was turn off so i went to turn back on with no joy(its just greyed out) i've hard resetted it,turn on/off fight mode, network reset......
PLEEEASE HELP!!!
Cheers Jay

Your WiFi chip has failed.  Bring your phone to Apple for replacement.

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