The reviews of the Jelly series seem to conveniently leave out how it is to type on. I would like that size but I need to be able to type a casual whatsapp message every once in a while or add an appointment to my calendar.

I am considering buying something cheap and (relatively) small from AliExpress to see how that works and if it's a size I like. I'd hate to spend Unihertz prices only to find out it's too small for me.

It's great, but a bit too small and thick (...let me just stop you there), and the design is just not really modern or elegant. I didn't have problems typing on it, personally. But it's either the Jelly Star, at 3", or you basically jump straight up to 6" minimum.

Interesting, but taking it a too far to the tiny end - I don't need a phone I can hide in my prison pocket, just one that fits in my regular ones.
Also Unihertz has terrible software support and doesn't provide android upgrades for their phones, so it's already in a sense 7 months out of date - and sadly obscure enough that there isn't much custom rom development either.