Months after his school banned cellphone use during class time, Cameron Marvin is breathing a little easier. Before the ban, the eighth grader at Pelham Memorial School saw the phones do more harm than good. Kids would show off memes in the classroom, creating distractions. Teachers would interrupt a lesson to tell those students to put the phones away – another distraction. And breaks to the bathroom were fraught with the prospect of pranks, vandalism, and disruptive behavior, all filmed on students’ phones to be posted for later online glory…