You actually can lead a productive socially rich life and even run a tech company in the modern world without using any products by Google, Microsoft, Meta, Apple, etc.
There are open source alternatives to everything if we do research beyond what is advertised to us.
I'd recently twigged that I don't want a mobile phone that forwards to, say, an Asterisk server I control, but an Asterisk server (and VOIP number(s)) I can optionally forward to a mobile or other service (e.g., possibly Jitsi Meet or Signal).
That last I could then interact with on a subnotebook laptop or tablet device. The phone would principally exist as a tether or true-emergency comms.
I can say Zoiper worked just fine for employees and Zoiper installs were set up very similarly to how we set up take-home phones; they had/have a browser extension to click-to-dial numbers in our ticketing systems, which was nice -- there may be good FOSS software out for these tasks now.
I don't do anything special at home; I just use a headset connected to PC for Google Voice with a free (in the US, at least) number and don't even see when calls come in unless they leave a message or I know someone's going to call and I leave a Google Voice tab open. Messages get forwarded to email. There are sometimes services I can't sign up for as a result of only having a VOIP number -- Anthropic in particular comes to mind as a company which blocks VOIP numbers for signup, but no essential services (e.g. bank, broker, kids' school) in the 10 or so years I've been phoneless. Yealink makes a really nice DECT headset I use (a WHB640) in and around the house, but it's way too expensive; fantastic range, though.