APPENDIX168Hearing aidsSome digital wireless phones may interfere with some hearing aids. Inthe event of such interference, you may want to consult your serviceprovider (or call the customer service line to discuss alternatives).Other medical devicesIf you use any other personal medical device, consult themanufacturer of your device to determine if they are adequatelyshielded from external RF energy. Your physician may be able to assistyou in obtaining this information. Turn your phone OFF in healthcarefacilities when any regulations posted in these areas instruct you todo so. Hospitals or healthcare facilities may be using equipment thatcould be sensitive to external RF energy.VehiclesRF signals may affect improperly installed or inadequately shieldedelectronic systems in motor vehicles. Check with the manufacturer orits representative regarding your vehicle. You should also consult themanufacturer of any equipment that has been added to your vehicle.Posted facilitiesTurn your phone OFF where posted notices so require.Other safety guidelinesAircraftFCC regulations prohibit using your phone while in the air. Turn yourphone OFF before boarding an aircraft. Always request and obtainprior consent and approval of an authorized airline representativebefore using your phone aboard an aircraft. Always follow theinstructions of the airline representative whenever using your phoneaboard an aircraft, to prevent any possible interference with airborneelectronic equipment.Blasting areasTo avoid interfering with blasting operations, turn your phone OFFwhen in a “blasting area” or in areas posted: “Turn off two-way radio.”Obey all signs and instructions.Potentially explosive atmospheresTurn your phone OFF when in any area with a potentially explosiveatmosphere and obey all signs and instructions. Sparks in such areascould cause an explosion or fire resulting in bodily injury or evendeath.Areas with a potentially explosive atmosphere are often, but notalways, clearly marked. They include fueling areas such as gas stations;below deck on boats; fuel or chemical transfer or storage facilities;vehicles using liquefied petroleum gas (such as propane or butane);areas where the air contains chemicals or particles, such as grain, dust,or metal powders; and any other area where you would normally beadvised to turn off your vehicle’s engine.