Disable login shell to be accessible over serial (raspi-config -> (5) -> (P6) -> (No)).
sudo apt update -y
sudo apt dist-upgrade -y
sudo rpi-update
apt-get install -y libqmi-utils udhcpc
Plug USB to 'off' USB side (not the UART USB labeled USB port).
There should be a /dev/cdc-wdm0 available.
qmicli -d /dev/cdc-wdm0 --dms-set-operating-mode='online'
qmicli -d /dev/cdc-wdm0 --dms-get-operating-mode
qmicli -d /dev/cdc-wdm0 --nas-get-signal-strength
qmicli -d /dev/cdc-wdm0 --nas-get-home-network