I did not find any UI for setting preferred or allowed networks (3G/4G) on the web interface of the RUT240.
If I remember, i have seen it on RUT950.
The modem seems to support it, these command seems to be working:
root@Teltonika-RUT240:~# uqmi -d /dev/cdc-wdm0 --set-network-modes lte
root@Teltonika-RUT240:~# uqmi -d /dev/cdc-wdm0 --set-network-modes all
What is the reason it is not supported on the UI?
Why is RUT950 different?