Short answer: “eyes glued to iPhone”, however distractions of any kind existed before the smartphone from people blasting loud music with headphones via a walkman, putting the radio at max volume, having either a book or newspaper obstructing one’s view. You get the point, I once heard an incident involving a woman almost getting ran over by a street car in Turkey all because she’s glued to the phone screen whilst walking.
The other day I was driving down a single-lane road and there was a guy literally standing motionless in the middle of the road looking at his phone.
I got right up behind him without him noticing (earphones in) and then blasted the horn.
I think it made quite an impression on him.