Yeah you can change the routher IP from the GL UI.

https://docs.gl-inet.com/en/3/setup/lan_ip/

If you SSH into the router, you can write some commands:

uqmi -d /dev/cdc-wdm0 --start-network APN --autoconnect

Replace APN with your apn in the command above. Then run this:

uqmi -d /dev/cdc-wdm0 --get-data-status

You should see “connected”.