I used a string of KaiOS devices mostly as my primary device from ~2017-2023.
I loved the battery life, the lack of distraction, the size and portability. I liked KaiOS because I could still chat via Facebook, Whatsapp, check email, maps, when I needed to. But it was annoying enough that I didn't spend much time in them. I loved/hated the physical T9 keys. I could text while not even looking, but it definitely was never as fast as a smartphone. If the predictive text was better it may have worked out.<p>The problems are
1. The camera. I had multiple devices with different levels of camera but it's truly a marvel of our world that I can carry around something that takes cinema-quality photos immediately. Dumb phones do not have good cameras. It's almost useless to even include one, I mostly just used it to remember specific posters/signs like parking.<p>2. The 'requirement' to use smartphone apps. Certain bank logins need an authenticator app. The Canadian border required Arrive can. Some concerts use apps for tickets. Yes, there are workarounds. Yes, it's possible to live without these.. But I can tell you from firsthand experience it's getting harder and harder, more annoying. This is actually simultaneously the reason I stuck with it so long, as a sort of protest against the direction our society is going.. but alas it didnt quite last.<p>3. Job changed, I needed to access discord while working at a bar. I realized I was carrying BOTH phones around for almost all of 2023, using my dumb phone for calls and texts, and my smartphone with WiFi to run discord and a few other apps. It felt stupid and was annoying so I bit the bullet and switched my sim to the smartphone.<p>4. I literally listen to less music. The music player apps were all garbage and it's no longer 2007 so it's not really fun to maintain a library of mp3s on a device. None of the KaiOS devices support streaming music.<p>If someone comes out with a small "dumb" phone with maps, Spotify, a great camera, and support for signal, Whatsapp, maybe FB messenger, and a basic browser, with good predictive typing and an OS that doesn't lag, I would pay a premium for it.<p>Edit: one of the most annoying side effects is when I'm in public trying to check maps or write a text and suddenly everyone around me asks "omG is that a flip phone???" and I am not a rude person so I maintain a slight conversation while they pry and ask to see it and show their other friends. Slows down the process of quickly using my phone quite a bit