Zte R621J User Manual page 10

 To avoid possible interference with blasting operations, switch off
your phone when you are near electrical blasting caps, in a blasting
area, or in areas posted "Turn off electronic devices". Obey all signs
and instructions.
Precautions for Electronic Devices
 Some electronic devices are susceptible to electromagnetic interference
sent by mobile phone if inadequately shielded, such as electronic
system of vehicles. Please consult the manufacturer of the device before
using the phone if necessary.
Safety and General Use in Vehicles
 Safety airbag, brake, speed control system and oil eject system
shouldn't be affected by wireless transmission. If you do meet problems
above, please contact your automobile provider. Do not place your
phone in the area over an airbag or in the airbag deployment area.
Airbags inflate with great force. If a phone is placed in the airbag
deployment area and the airbag inflates, the phone may be propelled
10