LTE works, GSM does not

[NaN INF NaN]

Thanks for the reply. I gave nwscanmode a try but it did not help. I set it to 1 and then omitted the optional parameters to check that the setting arrived at the modem. Indeed, the response is:

Code:

+QCFG: "nwscanmode",1

But then for some reason, 3gpp-scan still gives the same result with a few LTE networks and a GSM network of another carrier (same after a reboot):

Code:

$ mmcli -m 0 --3gpp-scan --timeout 300
  ---------------------
  3GPP scan | networks: 26203 - o2 - de (gsm, forbidden)
            |          26202 - Vodafone (lte, forbidden)
            |          26203 - o2 - de (lte, forbidden)
            |          26201 - TDG (lte, available)

I had already tried something similar using --set-allowed-modes in mmcli but that just removed all the LTE networks, reducing results to o2 GSM.

The problem with the LTE network that I receive at home, is that I cannot register in it at all. I get a network timeout:

Code:

$ mmcli -m 0 --3gpp-register-home --timeout 300
error: couldn't register the modem: 'GDBus.Error:org.freedesktop.ModemManager1.Error.MobileEquipment.NetworkTimeout: Network timeout'

Thus, voLTE is not an option either.

On a few seldom occasions, it managed to register and connect to LTE at home. I even managed to load a webpage once but the bandwidth was absolutely abysmal and unstable. Not a single picture loaded. It disconnected shortly after and then upon trying to reconnect gave me:

Code:

$ mmcli -m 0 --3gpp-register-home --timeout 300
error: couldn't register the modem: 'GDBus.Error:org.freedesktop.ModemManager1.Error.MobileEquipment.NetworkNotAllowed: Network not allowed - emergency calls only'

In other news: I've also tried all the different ADSP firmware versions now. 30.004 was preinstalled, the seldom 4G connects happened with 30.006 or 01.002.