LG V30 Guide De L'utilisateur page 56

Do not lose your SIM card. LG is not responsible for damage and other
issues caused by loss or transfer of a SIM card.
Be careful not to damage the SIM card when you insert or remove it.
When you insert the SIM card or memory card, place it on the card tray
correctly.
When you insert the card tray back into the device, insert it horizontally
in the direction of arrow as shown in the figure. Make sure that the card
placed on the card tray does not move out of its position.
Insert the SIM card with the gold-colored contacts facing downwards.
Be sure to insert the SIM card into the device by following the
instructions in the user manual.
If you insert to or remove the card tray from the device, be careful not
to let water or other liquids enter into the card tray. If a wet card tray or
card is inserted into the device, your device may get damaged.
Memory card is an optional item.
Frequent writing and erasing of data may shorten the memory card
lifespan.
Some memory cards may not be fully compatible with the device. If you
use an incompatible card, it may damage the device or the memory card,
or corrupt the data stored in it.
Basic Functions 55