Why do kids even need a phone in school? There is no reason they'd need one since they should be learning a subject. At best they'd need a calculator but there

Why do kids even need a phone in school? There is no reason they'd need one since they should be learning a subject. At best they'd need a calculator but there are cheap stand alone ones. Here in Canada a few schools have said no phones during school even lunch hour. The kids themselves have said they find they feel better and their studies are better. A phone now would be like allowing comic books to be read in class say in the 1980s.