Huawei MediaPad M2 10.1 (M2-A01L) - Manual (Page 4)

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Card insertion
 Use standard micro-SIM cards. SIM cards that are
manually cut or in a sleeve may damage the card slots.
 Do not insert or remove a SIM or microSD card while
your M2 is on.
 With the card tray horizontal, make sure that the beveled
edge of the card is aligned with the card tray.
Store the card eject tool in a safe place out of reach
of children to prevent them from swallowing it or
injuring themselves by accident.