iPhone 4s wifi greyed out

Apple Genius showed me how to fix this today!!!!! And it worked!

1. Back up iPhone as always (just in case)

2. Goto settings

3. Select Reset

4. Select Reset All Setting

NOTE: Your data all remains in tact, but you will need to reconfigure you iPhone (eg wallpaper, ringtone selection, mail signature etc as they will return to the defaults).

My iPhone 4S now has wifi and Bluetooth back!

reset all the settings its not working......

See:

iOS: Wi-Fi or Bluetooth settings grayed out or dim

If not successful, time for an appointment at the Genius Bar of an Apple store.

Apple Retail Store - Genius Bar

thanks the freezer in a bag method worked...condensation conductivity?