I've had a work provided phone and a personal phone for a long time and so most of the people I know.
Sometimes I've had a work iPhone and a personal Android, and now a work Android and a personal older iPhone.
I'd be worried about mixing up business and personal chats and photo galleries. Like if I need to take a picture with my work phone it's usually of something work related.
Or forwarding the wrong meme on a business chat, or attaching the wrong file in a family/friend message could land me in trouble.
How does it work in NDA'd work environments? Like when company's information can't leave company's devices? Is BYOD accepted in those cases? Like with MDM managed phone or workspace separation?