560
Nearly 500 smartphone brands have left the market since 2017
(www.techspot.com)
This is a most excellent place for technology news and articles.
I just asked my iphone-hqving mom who knows nothing about tech and she named 5.
I mean, anyone who has a "non-iohone" would be able to at least name the non-iohone(s) they have had. Including phone brands from before iphones that they may guess are still around.