Congrats on the new car, we pick up my Wifes XC90 tomorrow, so will be interested to see what questions you have that may also apply to us.
With regards to a Data Sim, I think we will purchase a 12gb , 12 month Three network Sim, see how it goes and whether we use it before a larger commitment. We use them currently when away in the caravan and they work really well. No contract and not a lot of outlay. The 12 month limit starts from when you register it. Currently £28, but does sometimes drop a little on promotions.
https://www.mymemory.co.uk/3-payg-4g...12gb-data.html