Zte A39 User Manual page 15

mobile phone when it is in flight. Using mobile phone before the plane taking off
should get aircrew's permission according to safety regulations.
If the mobile phone has the function of automatic timing power-on, please check
your alarm setting to ensure that your phone will not be automatically turned on
during flight.
Battery use
Do not short-circuit the battery, as this can cause overheating to bring about fire.
Do not store battery in hot areas or throw it into fire. Otherwise, it will cause
explosion.
Do not disassemble or refit the battery. Otherwise, it will cause liquid leakage,
overheating, explosion and ignition of the battery.
Please store the battery in a cool dry place if you don't use it for a long period.
The battery can be recharged for hundreds of times, but it will eventually wear out.
When the operating time (talk time and standby time) is noticeably shorter than
normal, it is time to replace a new one.
Please stop using the charger and battery when they are damaged or show
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