Samsung WMG160 Manual page 28

Potentially Explosive Environments
Switch your device off when in any area with a potentially explosive
atmosphere and obey all signs and instructions. Sparks in such areas
could cause an explosion or fire resulting in bodily injury or even death.
Users are advised to switch the device off while at a refueling point
(service station). Users are reminded of the need to observe
restrictions on the use of radio equipment in fuel depots (fuel storage
and distribution areas), chemical plants or where blasting operations
are in progress.
Areas with a potentially explosive atmosphere are often but not always
clearly marked. They include below deck on boats, 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 be advised to turn off your vehicle engine.