Huawei 5G CPE Pro Quick Start Manual page 4

Setup
1 Make sure you use the correct SIM card.
mini-SIM (2FF)
2 Open the SIM card cover.
3 Insert the SIM card gently into the SIM card slot in the
direction shown in the figure below until it clicks. Then close
the SIM card cover.
nano-SIM (4FF)
micro-SIM (3FF)
2