Comment 6 for bug 1910550

As requested here is the output from modemmanager about our modem:

ubuntu@ubuntu:~$ mmcli -L
    /org/freedesktop/ModemManager1/Modem/0 [Sierra Wireless] HL7648
ubuntu@ubuntu:~$ mmcli -m 0
  --------------------------------
  General | dbus path: /org/freedesktop/ModemManager1/Modem/0
           | device id: e758c92bbc1c13f82c9cf271815b8e659d70344a
  --------------------------------
  Hardware | manufacturer: Sierra Wireless
           | model: HL7648
           | firmware revision: SWIMCB71XX-AIM1.04.02.A14.164804.201802221656.01
           | supported: gsm-umts, lte
           | current: gsm-umts, lte
           | equipment id: 014697000106770
  --------------------------------
  System | device: /sys/devices/platform/soc/3f980000.usb/usb1/1-1/1-1.2
           | drivers: cdc_acm, cdc_ncm
           | plugin: Generic
           | primary port: ttyACM2
           | ports: wwan1 (net), wwan3 (net), wwan0 (net), wwan2 (net),
           | ttyACM2 (at), ttyACM0 (at)
  --------------------------------
  Status | unlock retries: sim-pin (3), sim-puk (10), sim-pin2 (3), sim-puk2 (10)
           | state: registered
           | power state: on
           | access tech: lte
           | signal quality: 40% (recent)
  --------------------------------
  Modes | supported: allowed: 2g, 3g, 4g; preferred: none
           | current: allowed: 2g, 3g, 4g; preferred: none
  --------------------------------
  IP | supported: ipv4, ipv6, ipv4v6
  --------------------------------
  3GPP | imei: 014697000106770
           | operator id: 310410
           | operator name: AT&T
           | registration: home
  --------------------------------
  3GPP EPS | ue mode of operation: ps-2
  --------------------------------
  SIM | dbus path: /org/freedesktop/ModemManager1/SIM/0
ubuntu@ubuntu:~$