Nubia NX521J User Manual page 72

Broken antenna
Don't use your phone if the antenna is damaged, as it could cause injury.

Please do not touch or cover the antenna area (the upper part on the back of

your phone) during the conversation to avoid affecting talk quality and
consuming more battery power, which might reduce the talk time and standby
time.
Around children
Keep your phone out of children's reach. It should never be used as a toy and it

might not be good for their health.
Original accessories
Only use the original accessories supplied with your phone or those approved

by the manufacturer. Using unapproved accessories may affect performance,
make the warranty void, break national regulations on the use of phones, or
even cause injury.
Near explosives
Turn off your phone in or near areas where explosive materials are used.

Always obey local laws and turn off your phone when requested.
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