In fairness, I've got a foldable flippy type phone and the number of conversations it starts is unreal. If I wasn't happily attached (and had more banter than the average housebrick) I'm sure it'd lead to some good chats and encounters.
As it stands though, it's just a nice talking point.
e: plus it's satisfying as fuck ending a call by closing the phone.
Years ago I had one that was spring-loaded so you'd press a little button on the side and it would pop open in one move. I really liked that phone. Don't remember what brand it was.