That is orthogonal to having a smart phone on you 24/7. I trained my friends and family not to expect instant replies (or me always picking up phone calls), but I use the phone also to read stuff, search for stuff, and note down stuff, so I do want it on me all the time.

I'm usually in the same place, and using my Linux desktop. I guess that's why I've always found it hard to get interested in phones: annoying devices with too-small screens, slow data entry and usually a locked-down OS with no updates.