Sec.  22.925   Prohibition on airborne operation of cellular telephones.

   Cellular telephones installed in or carried aboard airplanes, balloons or
   any other type of aircraft must not be operated while such aircraft are
   airborne (not touching the ground). When any aircraft leaves the ground, all
   cellular telephones on board that aircraft must be turned off. The following
   notice must be posted on or near each cellular telephone installed in any
   aircraft:

   “The use of cellular telephones while this aircraft is airborne is
   prohibited by FCC rules, and the violation of this rule could result in
   suspension of service and/or a fine. The use of cellular telephones while
   this aircraft is on the ground is subject to FAA regulations.”