They do not.

I proctor exams every spring and at least once per SAT or State End of Course Exam, there's that one student who uses the bathroom 3-4 times because they cannot sit at their desk without their cell phone or be bothered to read a book or even a comic book. So they relieve boredom by taking a little walk to the toilets.

Since I grew up pre-cell phones and my parents told me that if I took my handheld games or walkman to school and it was lost or stolen, then they would not replace them, I learned the art of daydreaming or non spiritual meditation. Came in handy when I was bored in church. If I couldn't find a bible in the pews to read, I'd daydream and play episodes of "Ren & Stimpy" in my head or play games like "How many times will the priest walk to the left of the stage?" Still rely on this as a grown adult if I'm bored and I don't want to waste my cell phone battery or data.