Your cellular terminal or mobile contains a transmitter and receiver. When it is ON, 
it receives and transmits radio frequency energy. RF interference can occur if it is 
used close to TV set, radio, computer or other electric equipment. 
In locations with potentially explosive atmospheres, obey all posted signs to turn 
off wireless devices such as your phone or  other cellular terminals. Areas with 
potentially explosive atmospheres include fuelling areas, below decks on boats, 
fuel  or  chemical  transfer  or  storage  facilities,  areas  where  the  air  contains 
chemicals or particles such as grain, dust or metal powders, etc.