LG V30 Guide De L'utilisateur page 53

Your device has an internal rechargeable battery. For your safety, do not
remove the embedded battery.
Some functions may be restricted for access, depending on the device
specifications.
The rear of the device includes a built-in NFC antenna. Be cautious when
handling the device to avoid damaging or covering the NFC antenna.
Do not put heavy objects on the device or sit on it. Failure to do so may
damage the touch screen.
Screen-protective film or accessories may interfere with the proximity
sensor.
If your device is wet or is being used in a humid place, the touch screen
or buttons may not function properly.
Hold the device correctly as shown below. If you cover the microphone
hole with a hand, finger, or protective case while using the device, you may
sound unclear during a call.
Good example
Microphone
Basic Functions
Bad example
Do not cover the microphone.
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