Zte A39 User Manual page 13

Prevent liquid from leaking into your phone.
Do not drop, knock or harshly treat the phone. Rough handling can break internal
circuit boards.
Do not connect the phone with any incompatible enhancement.
Do not attempt to disassemble the mobile phone and battery.
Do not store the phone with flammable and explosive articles.
Do not charge the mobile phone without battery.
Precautions for Potentially Explosive Atmospheres
Switch off your phone prior to entering any area with potentially explosive
atmospheres, such as fueling areas, fuel or chemical transfer or storage facilities.
Do not remove, install, or charge batteries in such areas. Sparks in a potentially
explosive atmosphere can cause an explosion or fire resulting in bodily injury or
even death.
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.
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