Restrict modem (EC21) one of 3G or 4G - ModemManager 1.10.0 (Debian Buster)

Brendan Simon (eTRIX) brendan.simon at
Sun Oct 25 21:10:26 UTC 2020

On 21/10/2020 3:59 pm, Brendan Simon (eTRIX) wrote:
> On 19/08/2020 2:13 am, Aleksander Morgado wrote:
>>> There is a recent patch to avoid this, by avoiding the use of "NAS
>>> Register in Network" and use "NAS Set System Selection Preference"
>>> instead:
> So it's been a while, but I now have MM 1.14.2 installed on my 
> embedded system via Debian Buster Backports repo.
> I can successfully set the allowed mode to "3G" and get a UMTS connection.
> *    mmcli -m 0 --set-allowed-modes="3G"*
> However, if I try to lock to 4G the connection *never succeeds*.
> **
>     mmcli -m 0 --set-allowed-modes="4G"**
> The only way I can get an LTE connection is with the following.
> **
>     mmcli -m 0 --set-allowed-modes="3G|4G" --set-preferred-mode=4G**
> *Is this a bug?  Maybe there is something else going on**?**
> **Any ideas or suggestions to get an LTE connection with setting 4G as 
> the only allowed mode?*

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