Earlier quoted context omitted.
There's no real difference in that situation, but people don't generally read paperback books when out to dinner with friends, while driving on the highway, while walking on a crowded sidewalk, during a movie at the theater, during class at school or in a meeting at work... which are all common situations where I regularly see people glued to their phones.
I have to admit to two of those :)
But then, when I was in college, I'd read paperbacks while riding a bike to class.