Interested in hearing everyone's experience using alternative phone OS's. Have you ever used Lineage or Graphene, Pursim, pinephone? Was it good enough to replace your android/iphone?
HarmonyOS I love the new Huawei OS and love that they made an open source version, OpenHarmony, me and my friend screw around with it on an old recycled google home with the big touch screen. But yeah, I love HarmonyOS, way prefer it to android os
I am using Lineage but not really sure if it qualifies, it is still an android. Overall, it is pretty good. The main issues I am getting is due to the fact that I didn't install version with Google services, and I am using MicroG instead (open source implementation). Some applications don't like it, and you have to do some trickery with rooting to have a chance to run them (for example our national identification application), but it is pretty rare.
I would recommend it if you want to still be able to use everything you need but want a bit more FOSS experience.