In high school or middle school (or elementary school if those kids get loving phones) no. Kids don't have important stuff, they just want to forget around and text.
But in college where people have like kids and jobs and stuff, and are actually serious when they say they need their phone for serious things, then yeah. My college recognized that, and everyone was good at turning it to silent/vibrate and leaving the room if they have to take a call. I did have one crazy teacher who absolutely insisted "No, nothing bad will ever happen to you that you'll need a phone for, you shouldn't even bring your phone into this building"
She was a pretty bad teacher in general. She spend half of each class day talking to us about her chickens and home farm thing and complaining how her neighbors don't like it. I remember her saying she specifically asked for the class to be scheduled on Friday mornings (my school very seldom scheduled Friday classes) specifically so people had to wake up at a time they weren't used to. She said she wanted it to be Saturday but they wouldn't give her that.