It’s a document scanner, a document-signing device (we did basically the entire house search, offer,
and closing process all on our phones, last time), flashlight (I use this daily), camera that can do “live photos” (they’re magical, I have zero interest in a camera that doesn’t do that), a check-depositing terminal, a tape measure or level (in a pinch), a note-taking device, and so much more. Music player. Alarm clock. A credit card.
My phone is without a doubt the single most-useful electronic gadget in my house, and it’s not a close call. My desktop machine and laptop are nothing but toys unless I’m building stuff for computers. (My tablet is the second most-useful, and again, it’s not a close call)