LG G4c User Manual page 352

Removing the memory card
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WARNING
Do not remove the memory card while the device is transferring or accessing
information. Doing so can cause data to be lost or corrupted or damage to
the memory card or device. It is not responsible for losses that result from the
misuse of damaged memory cards, including the loss of data.
Locking and unlocking the device
Power/Lock Key
NOTE: Double-tapping on the screen also can wake up the screen instead of
the Power/Lock Key.
Changing the screen lock method
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General Storage Unmount SD card
Power/Lock Key
Display Lock screen Select screen lock
Getting to know your phone