This isn't feasible, not even remotely. I work from home, do I just stop doing my job? Because I cannot possibly work under such an assumption, at all. I can pretend to, but there is way enough that I must communicate that really should not become public. A lot of other people are in the same boat I guess, especially these days.
Also, not sending anything remotely personal through my phone would make it very, very hard to keep in touch with friends and family. I can't travel to see all of them all the time, and Covid makes meeting the local ones really difficult, too.
I don't think it's constructive to cast huge societal issues as individual failings, with remedies that are absurdly impractical. That only helps to perpetuate the problem.