They have a Jelly Max https://www.unihertz.com/products/jelly-max and this looks too good to be true. I am sure one catch would be that it's not sold in my geography but still. Does it have at least few years of OS update support and more than few years of security updates?

My impression was that their update cadence is ~never and that the Jelly Max is rather closer to iPhone-SE-sized. The last one I handled was for ephemeral use on a trip abroad. It was durable, functional, and it worked wonders as far as breaking the phone-checking dopamine cycle.

I'd never come anywhere close to trusting it with anything important, but then again maybe that's not such a bad relationship to have to a smartphone...