Earlier quoted context omitted.
> Very few ISPs can track you no matter where you physically go, as your mobile, home, and work ISPs are likely all different. There's a lot of consolidation happening in that space. Verizon offers FiOS and phone service. Comcast is getting into the mobile game. That aside, any device by itself is enough to get a picture of the user using only tracing IP addresses (i.e. DNS lookups and outbound requests). They don't…
Google also has Fiber and Fi, but in reality, I think the likelihood any given user has land and mobile access through the same company is relatively low, and you usually have the option to switch at least one of them. AT&T is probably the biggest player in succeeding at being the ISP for you everywhere though.
https://www.ispreview.co.uk/index.php/2018/02/vodafone-uk-ho...
https://www.choose.co.uk/guide/home-broadband-market-overvie...