About 4 years ago (24th of June 2021, according to my old tweet: https://x.com/JD557/status/1408166583575449601) I got a KaiOS phone (Nokia 8000 4g) for emergency use.
It has proven to be pretty useful over the years.
Mostly as a WiFI hotspot when abroad (that way I don't have to buy a data plan for me and another for my girlfriend, and we save our smartphone battery a bit), but it's also pretty nice to have a phone with a long battery life that lets me do some normal modern day stuff (such as check ActivityPub).
Yesterday it also proved pretty useful. Due to the Iberian blackout, I was without power and comms during most of the day, so having a radio around was great to listen to the news without having to be in my car.
I wouldn't recommend anyone to buy this particular mode though, as the keyboard is garbage.