root@armadillo:~# nmcli connection add type gsm ifname ttyUSB2 apn sakura
Connection 'gsm-ttyUSB2' (b25beeb5-0e34-423f-921f-8808d883327a) successfully added.
root@armadillo:~# nmcli connection modify gsm-ttyUSB2 gsm.sim-operator-id 44020
root@armadillo:~# nmcli connection down gsm-ttyUSB2
Connection 'gsm-ttyUSB2' successfully deactivated (D-Bus active path: /org/freedesktop/NetworkManager/ActiveConnection/1)
root@armadillo:~# nmcli connection up gsm-ttyUSB2
Error: Connection activation failed: No suitable device found for this connection.
root@armadillo:~#