"Feature phone" can often have some android installed on it. From all definitions I ever saw, it was mostly about form factor (keeping that old Nokia looks with

"Feature phone" can often have some android installed on it. From all definitions I ever saw, it was mostly about form factor (keeping that old Nokia looks with physical buttons). Nokias now have something called KaiOS, unix-based OS where you can develop just like elsewhere. Porting some app into another OS would be probably a showstopper due to budgets/deadlines, even though even my old Nokia in 2006 could easily run java apps like these (but ended up mostly running Snake et al).