Hello,
Can you explain exactly how the PLMN functionnality is implemented? It might be one of the greatest improvements on cellular connectevity management for a while 
I see now:
Cellular 1 health check failed, restrict network to lower priority PLMN - 20620
Does it mean that the router will itself reorganise the list of PLMN configured? Can this list be super long and redefine roaming order for any country/operator in the world?
Thanks for the clarification