Phones are disappearing from classrooms. There’s no longer a soundscape of notifications during lessons, no more hidden glances at messages and DMs. No longer does the slacker in the back of class scroll endlessly on TikTok. At least 37 states, as well as Washington D.C., have banned phones and other electronic devices. It costs a hefty amount to do so. New York City public schools have allocated $29 million on phone pouches to hold devices duri…