ZTE Grand X Plus - Manual (Page 181)

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Emergency Calls
This phone, like any other wireless phone, operates using radio
signals, which cannot guarantee connection in all conditions.
Therefore, you should not rely solely on any wireless phone for
emergency communications.
Loud Noise
This phone is capable of producing loud noises, which may
damage your hearing. Turn down the volume before using
headphones, Bluetooth headsets or other audio devices.
Phone Heat
Your phone may become warm during charging and during
normal use.
Electrical Safety
Accessories
Use only approved accessories.
Do not connect with incompatible products or accessories.
Take care not to touch metallic objects, such as coins or key
rings, or allow them to contact or short-circuit the battery
terminals.
Never puncture the surface of the battery with sharp objects.