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Today 10 years ago I got a Firefox OS phone
(jemmy.jeena.net)
This is a most excellent place for technology news and articles.
I know about the PinePhone Pro and I am quite experienced.
But even hardcore hairy dude like Drew Devault disavowed it (source).
It seems that the main complaint is calls and SMS. I use different distro (Arch, btw) with FOSS firmware for the modem and calls / SMS work fine for me.