[i-use-nixos-btw]

This is the way landline phones are going in the UK (edit: I’m referring to the “phone over the internet” aspect, not the space aspect). I don’t see why the same doesn’t apply to mobile phones.

However the notion that it makes phone numbers and ISPs obsolete is naive in my opinion, as is the notion that it would improve privacy. Quite the opposite. Aside from death and taxes, certainties include that businesses adapt to changing markets, and that privacy is always at threat.