LTE Standard Module Series
EC21_Series_Hardware_Design
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Safety Information
The following safety precautions must be observed during all phases of operation, such as usage,
service or repair of any cellular terminal or mobile incorporating the module. Manufacturers of the cellular
terminal should notify users and operating personnel of the following safety information by incorporating
these guidelines into all manuals of the product. Otherwise, Quectel assumes no liability for customers’
failure to comply with these precautions.
Full attention must be paid to driving at all times in order to reduce the risk of an
accident. Using a mobile while driving (even with a handsfree kit) causes
distraction and can lead to an accident. Please comply with laws and regulations
restricting the use of wireless devices while driving.
Switch off the cellular terminal or mobile before boarding an aircraft. The operation
of wireless appliances in an aircraft is forbidden to prevent interference with
communication systems. If there is an Airplane Mode, it should be enabled prior to
boarding an aircraft. Please consult the airline staff for more restrictions on the
use of wireless devices on an aircraft.
Wireless devices may cause interference on sensitive medical equipment, so
please be aware of the restrictions on the use of wireless devices when in
hospitals, clinics or other healthcare facilities.
Cellular terminals or mobiles operating over radio signal and cellular network
cannot be guaranteed to connect in certain conditions, such as when the mobile
bill is unpaid or the (U)SIM card is invalid. When emergency help is needed in
such conditions, use emergency call if the device supports it. In order to make or
receive a call, the cellular terminal or mobile must be switched on in a service
area with adequate cellular signal strength. In an emergency, the device with
emergency call function cannot be used as the only contact method considering
network connection cannot be guaranteed under all circumstances.
The cellular terminal or mobile contains a transceiver. When it is ON, it receives
and transmits radio frequency signals. RF interference can occur if it is used close
to TV sets, radios, computers or other electric equipment.
In locations with explosive or potentially explosive atmospheres, obey all posted
signs and turn off wireless devices such as mobile phone or other cellular
terminals. Areas with explosive or potentially explosive atmospheres include
fuelling areas, below decks on boats, fuel or chemical transfer or storage facilities,
and areas where the air contains chemicals or particles such as grain, dust or
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