A new study shows that more than a quarter of high school-aged students’ time spent on their smartphones occurs in school. It comes as state lawmakers across the country introduce and pass legislation aimed at cracking down on student cellphone usage in schools. The study, spearheaded by Seattle Children’s Hospital, found that among the more than 115 eighth- through 12th-grade students that it tracked, 25% of them spent more than two hours on their phones...