Final answer:
Cell phones should be banned in the classroom due to their negative impact on student grades, potential for distraction, and disruption of the learning environment.
Step-by-step explanation:
Cell phones should be banned in the classroom for several reasons. Firstly, studies have shown that students who use screens during class, including cell phones, have lower grades compared to those who don't use screens. Secondly, cell phones can be a distraction, as students may be tempted to check social media, play games, or engage in other non-class related activities. Thirdly, cell phones can disrupt the learning environment, especially if students use them for talking or texting during class.