> I would immediately jump ship if I could buy a phone that supports a truly free OS.

Is your definition of “Phone” equivalent to “must run apps (non-emulated) for iPhone and/or Android”? Otherwise, I mean, these things do exist: <https://puri.sm/products/librem-5/>

My definition of a phone platform is that a reasonable app ecosystem must exist. Or at least the ability to easily develop the ones I need - I don't mind developing for my needs. If a more secure phone without a substantial app ecosystem is enough, then a feature phone would be fine. Librem phone unfortunately doesn't meet that requirement.

The difficulty is that even many essential service APIs are not open to alternative implementations.