text: If a student uses their phone during free time it would most likely cause them not to use it during class. Say if a student vomited on the floor why waste time looking for the parent's number, you can simply get the child's cell phone and use contacts to find out the parent's number. Say a student breaks their leg, it will take forever to reach the phone all the way across the room, use the child's cell phone to dial 911. Think cell phones, think safe.