I was a teenager before smartphones were a thing.
Things I did when not phone, and no random book or comic nearby:
Waiting for bus: Running off to explore the plants behind the bus stop shed, missing the bus.
Waiting for bus: Trying to see if I could grab the bus stop sign and somersault by running up the bus stop shed wall. I could not, and faceplanted the concrete breaking my glasses.
On toilet: Grab shampoo bottles to read, comparing the grammar of the instructions.
School recess: Climb onto the school roof, get in trouble.
School recess: Try and kick the feet of a school bully while he was proudly demonstraring rhe roundhouse kick he learned to see if he would fall on his ass. He fell on his ass and we did not become friends.
The absence of a phone will not calm me down.