ZTE Grand X Plus - Manual (Page 182)

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Connection to a Car
Seek professional advice when connecting a phone interface to
the vehicle electrical system.
Faulty and Damaged Products
Do not attempt to disassemble the phone or its accessories.
Only qualified personnel can service or repair the phone or its
accessories.
If your phone (or its accessories) has been submerged in water,
punctured, or subjected to a severe fall, do not use it until you
take it to an authorized service center.
Radio Frequency Interference
General Statement on Interference
Care must be taken when using your phone in close proximity to
personal medical devices, such as pacemakers and hearing aids.
Please consult your doctor and the device manufacturers to
determine if the operation of your phone may interfere with the
operation of your medical devices.
Pacemakers
Pacemaker manufacturers recommend that a minimum
separation of 15 cm be maintained between a mobile phone and
a pacemaker to avoid potential interference with the pacemaker.