Huawei Mate 9 - Manual (Page 7)

3
Getting started
Follow the instructions in the following figures to set up
your phone. Before you insert or remove the SIM card,
power off your phone.
When using the SIM ejector pin, exercise caution to
avoid injuring yourself or damaging your phone.
Keep the pin away from children to prevent them
from accidentally swallowing it or injuring
themselves.
Caution
Insert your SIM card in the correct card slot;
otherwise, your phone may not detect the card.
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