From the Atlantic article they link:
I cannot overemphasize how little there was to do before we all had smartphones. A barren expanse of empty time would stretch out before you: waiting for the bus, or for someone to come home, or for the next scheduled event to start. Someone might be late or take longer than expected, but no notice of such delay would arrive, so you’d stare out the window, hoping to see some sign of activity down the block. You’d pace, or sulk, or stew.
Dude, read a book. What the fuck?
I don't have a smartphone and am happy to answer any other questions.