Huawei H122-373 - Setup; SIM Card Compatibility; Open SIM Card Cover; Insert SIM Card

Setup
1 Make sure you use the correct SIM card.
mini-SIM (2FF)
micro-SIM (3FF)
nano-SIM (4FF)
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.
2