Today 10 years ago I went to Poland to buy a Phone with pre installed #Firefox OS on. The Phone was a Alcatel One, so very shitty. Two years later I installed Firefox OS on my Nexus 5 instead.
It was a very good concept, but sadly rolled out on too shitty hardware so it never caught on.
i really hope these alt-mobile OS's take off, i know theres things like pinephone and kde mobile but they're still a little bit rough around the edges last i checked.. at the same time tho maybe i should do some more digging around. i imagine someone's made a daily-driveable alternate OS for phones at this point