Some of the open source phone projects are interesting. But I stopped carrying a phone entirely about 3 years ago.

HN is a weird crowd, so this obviously isn't a solution for +99% of people. But I'm choosing to opt out entirely. Living in the 90s is annoying when coordinating with unreliable people, but this isn't some kind of impossible feat. I don't even think about it anymore, it's a non-issue. Just get on with it.