Thanks Paul, as I think I mentioned, the setup is free, its the continuing service I am asking about, whether that is free. The technician said to check my bills, so it sounded doubtful, but nowhere can I find anything about cost of the actual service.
Re the sim card, all I have is the Virginmedia sim card holder where it says its 5g ready and I needed to keep that as the security pin no. on it is needed to top up the card. Presumably depending how many calls are made from it.....I don't know! He said the display on the phone would show when I needed to do that, I dont know if it is time or usage relevant. I guess that might provide the answer to my query if you know!