@scott @aud I've used Ubuntu Touch (ubports) on and off for years. It's great but bare bones. Biggest limiting factor for me is only a few devices have VoLTE support, which is essential in the US now that 3G networks have all be dismantled. Fairphone, Pine phone, and mediatek chipsets have support at the moment.
Sailfish OS is nice but only runs on a few devices. You could check out PostmarketOS - it runs on quite a few devices as well.
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Is there actually a phone + OS option out there that doesn’t regularly collect and report data (above and beyond the typical data that can be captured via cell phone networks, stingrays, and wifis).