41Switch off your phone in health care facilities whenregulations posted in these areas instruct you to do so.VehiclesRF signals may affect improperly installed orinadequately shielded electronic systems in motorvehicles. Check with the manufacturer or itsrepresentative regarding your vehicle.You should also consult the manufacturer of anyequipment that has been added to your vehicle.Posted facilitiesSwitch off your phone in any facility where postednotices require you to do so.Potentially explosive environmentsSwitch off your phone when in any area with apotentially explosive atmosphere, and obey all signsand instructions. Sparks in such areas could cause anexplosion or fire resulting in bodily injury or even death.Users are advised to switch off the phone while at arefuelling point (service station). Users are reminded ofthe need to observe restrictions on the use of radioequipment in fuel depots (fuel storage and distributionareas), chemical plants, or where blasting operationsare in progress.Areas with a potentially explosive atmosphere are oftenbut not always clearly marked. They include the areasbelow decks on boats, chemical transfer or storagefacilities, vehicles using liquefied petroleum gas, suchas propane or butane, areas where the air containschemicals or particles, such as grain, dust or metalpowders, and any other area where you would normallybe advised to turn off your vehicle engine.Emergency callsThis phone, like any wireless phone, operates usingradio signals, wireless, and landline networks as well asuser-programmed functions, which cannot guaranteeconnection in all conditions. Therefore, you shouldnever rely solely on any wireless phone for essentialcommunications like medical emergencies.