I found an option for a ‘free’ SIM on the Three network, so decided to install this in the vehicle (instead of connecting via WiFi to a ‘hotspot’ provided by my phone).
Short version, it doesn’t get detected, and doesn’t work. Longer version, the new SIM works in another device. My phone SIM, when transferred to the vehicle also now doesn’t work. So both SIMs work in other devices, neither SIM works in the vehicle.
Video of process shown below…
After some time, it just returns to…
NOTE: WiFi connectivity was turned off also, so as to avoid confusion.