I remember when the iPhone first came out. I was at a bar, at a table with a few people I didn't really know. This was a pretty common occurrence.
You usually got a drank, talked. This was a kind of gothic-theme bar, all done up with spooky decorations, a good dj, interesting drinks. We'd host arts/culture slide show jams before the place really would get going for the night. The art was curated and swapped out monthly. There was a lot going on! The place did a lot to charge the space with energy and excitement, bringing a lot of different people together.
Then this guy at the table whipped out his phone and just ignored us all sitting there.
I knew right then and there that this was the beginning of the end.
Thinking back to when I got my first smartphone 15 years ago, it occupied just so much of my attention and I figured it was some kind of honeymoon phase with a new gadget. But it never got less, if anything it's increased since then.
Even before the iPhone it started happening with the Blackberry, Palm, et. al. I distinctly remember the early-mid '00's when my aunt got her first BB, a 7250(?) and it quickly became more important than anything else. Family get-togethers started to consist of her sitting by herself on her phone while the rest of us enjoyed each other's company.