I am using MM 1.14.6 (from Deiban buster-backports) with Quectel EC21 (qmi).

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?*

*Is there any other info I can provide to help resolve this so I can use:

****    mmcli -m 0 --set-allowed-modes="4G"***

Thanks, Brendan.

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