Before phones, people were reading books or magazines separately in bed, or reading newspapers on the train. When I traveled to various third-world countries before phones were a thing and people didn't have money for newspapers, people stared blankly out into space on the train or bus or shared van. People weren't social with strangers. In various modern African cities, I just couldn't believe how much boredom was part of everyday life. And there didn't seem to be any redeeming qualities to the boredom... just boring, boring boredom.
Likewise (back in the US), children out at a cafe with the parents would sit drawing or reading children's books or yes, being bored out of their skulls (instead of on a cell phone now with books or games that practice hand-eye coordination). I remember long car trips as a child as excruciatingly, horribly, mind-numbingly boring.
And as for photos showing someone photographing... we've had cameras for many decades... I don't get the point at all.
I'm not even remotely convinced that phones are somehow making us less social. Rather they save us from extreme boredom, keep us in close touch with out intimate friends all day long if we choose, and even make it so much easier to see people and flexibly change plans. Remember when being "stood up" was a thing? In my experience it's... not, anymore. Someone will send you a message an hour beforehand they won't be able to make it, saving you a trip and letting you make new plans if you want.