LG G4 User Manual page 124

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Do not expose your device or its accessories to extreme temperatures.
Do not expose your device or its accessories to liquid or moisture.
Not groped to disassemble the device or its accessories, only
authorized personnel can do it.
This device, like any wireless device, operates using radio signals
which, by their nature, are not able to guarantee connection in all
conditions. Therefore, for emergency communications, never rely solely
upon any wireless device.
Only use approved accessories.
Please read these simple guidelines. Not following these guidelines may be dangerous
or illegal.
Should a fault occur, a software tool is built into your device that will gather a fault log.
This tool gathers only data specific to the fault, such as signal strength, cell ID position
in sudden call drop and applications loaded. The log is used only to help determine the
cause of the fault. These logs are encrypted and can only be accessed by an authorised
LG Repair centre should you need to return your device for repair.
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Description
Guidelines for safe and efficient use