I made a test with Emlid Reach RS2 where I have mounted a simcard and connected the RS2 to WiFi.
When the WiFi connection are lost, the RS2 start searching for the WiFi again.
It would be great if it could jump to the Simcard automatically after e.g. 20 second without connection to the WiFi.
Now you have to reboot the RS2 before it makes it’s own hotspot and use the simcard.