Dell XCD35 Smartphone - Manual (Page 14)

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this must be enabled prior to boarding an aircraft.
Interference in Cars
Please note that because of possible interference to electronic
equipment, some vehicle manufacturers forbid the use of
mobile phones in their vehicles unless a hands-free kit with
an external antenna is included in the installation.
Explosive Environments
Petrol Stations and Explosive Atmospheres
In locations with potentially explosive atmospheres, obey
all posted signs to turn off wireless devices such as your
phone or other radio equipment.
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.
Blasting Caps and Areas
Power off your mobile phone or wireless device when in a
blasting area or in areas posted power off “two-way radios”
or “electronic devices” to avoid interfering with blasting
operations.