MarcinG Or BlackBerry 10. I have used lot’s of phones especially in the mid 2000s through late 2010s. The Nokia N900 with Maemo, the Nokia E7 with Symbian3, then I switched to BlackBerry with BBOS 7 and had most BlackBerry phones with their BB10 OS - which was a great OS, very intuitive, fast and fun to use. Built to be used with gestures right from the start, the whole UX back than was more advanced compared to what Android offers today. Yet it failed, because developers never jumped on board. People wanted Netflix, Snapchat, Instagram and so on - but those were never officially ported to the OS. Then BlackBerry gave up and went with Android, looking back a number of BBRY enthusiasts think if they went with Android right away, they might still be around.
Inbetween I’ve also had a Nokia Lumia 1020 running Windows Phone, again I think the OS was very unique and intuitive in terms of UX, simple and efficient, yet in it’s own ways still eye catching. But it also failed due to missing app support from big developers.
I simply don’t believe Nothing as a still rather unknown and small company could pull off and ve successful with their complete own OS. Other who were much bigger and had much more ressources tried over the years and all failed. I mean Carl Pei just recently said they won’t even release a more compact Nothing Phone for the time being, as it most likely wouldn’t be profitable enough.