Yup, there's enough tech already in the phones to preclude their operation at, say, walking pace.
I can't tell you how many time I see people focused on their phone while in a crosswalk, or about to walk into a post, or pushing their baby strollers on sidewalks, etc.
Couple years ago I got a ticket from a young city cop who thought I'd run a stop sign in a slow residential area:
I was actually watching him stare at the computer in the center of his dash as he approached the intersection while I was stopped.
He looked up as I started across the intersection.
When he came up to my car and saw my phone next to me, he started to lecture me about our local cellphone laws.
I just started laughing...