Most dumb phones aren’t.

Dumb, that is. Virtually all of them have some version of Android or KaiOS or some other full-fat OS cosplaying as something “simple”. Litmus test: does your “dumb phone” come with a map app? A Facebook app? Can you install apps from an external source? If so, you don’t have a dumb phone.

The hallmark of a dumb phone is the lack of an OS that boots. You turn it on, and everything should be instantly and immediately available, loaded from ROM. No boot sequence, no waiting for anything to load.

The only truly “dumb phone” out there - as something “new” and not actually vintage - is the Rotary Un-Phone.