Huawei ATU-L31 Quick Start Manual page 6

Getting Started
Ensure that the card is correctly aligned and that the
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card tray is level when you insert it into your device.
Be careful not to scratch your device or hurt yourself
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when using the eject pin.
Store the eject pin out of the reach of children to
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prevent accidental swallowing or injury.
Do not use cut or modified SIM or microSD cards with
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your device as these may not be recognized and could
damage the card tray (slot).
Follow the instructions in the following figures to set up your
device. Please use the eject pin included.
Dual-SIM:
2