ModemManager

ModemManager is the default mobile broadband management service in most standard GNU/Linux distributions. It is used to manage the optional cellular modem in the Moduline IV and Mini. The CLI tool is called mmcli.

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To list available modems you can use:

mmcli -L

This will produce something like:
/org/freedesktop/ModemManager1/Modem/0 [QUALCOMM INCORPORATED] SIMCOM_SIM7600G-H
So the modem is currently assigned the number 0. If the modem is restarted it might get assigned a different number which will affect the other possible commands

To monitor the connection status of the modem use:

mmcli -m "modem number from above" -w

For other commands use:

mmcli --help

To see what else the tool can do.

Configuring the cellular connection is mostly done through NetworkManager instead.