My iphone 4S constantly shows "no wi-fi".  Any suggestions?

My iphone 4S constantly shows "no wi-fi".  Any suggestions?

gUYzz d besT thng u caN do is ...
i) RESTORE UA IPHONE 4S USING ITUNES
  click the restore icon in itunes after syncing ua iphone 4s
  back up datas optn will b der ...so no worries about the loss of datas
ii) EVEN AFTR RESTORING THE WIFI ICON IS GREYD ON UA IPHONE
   settings>general>reset>reset network settings
I SOLVED MY PROBLEM IN IPHON4S
FOLLOW THIS AND SOLVE UA IPHONE ISSUEZZ TOOOO

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