I was thinking rhetorically earlier and wondering, if I wanted in to future to change ISP's, I'm on BT, what would happen with the phone situation?
I think most people will be using the ISP's own VOIP service. I'm thinking I'd hold my number if I transfered to another OR FTTP connection? But if I moved to say CityFibre, would I lose my phone number during transfer?
I know having a separate VOIP is the best way to go.
I suspect the majority of people will just assume they can move around without problems. It was simpler when it was only OR and VM running separate networks.