When I was teaching learners, I asked a few what they were doing on their phones all the time, never got a proper answer.
When we were young, and used buses, the front seats upstairs were premium, as you could watch where you were going. All other seats give just a narrow view to the side. Having now got a bus pass, I recently used it to travel 43 miles each way on different days, and luckily got the top front seat on all six buses. However, the other front seats got occupied by a series of youngsters, who all spent the journey on their phones.
When driving, look at the top seats on any bus, most will be occupied by phones.
Selfish.
Last year, walking in a town centre, found myself catching up with a young girl, probably late teens. Unless disabled, I should not be catching her. As I passed, the view on the phone was the pavement ahead of her. She was using the camera to show her the way along the street. We're doomed.