At last year’s school, my kids were not allowed to use phones in class (except legitimate uses), nor to have notifications/ringers on audible, but if course the kids carried them.

This year: new school so I don’t know. However the combination of really crappy Chromebook from the school (don’t ask me how they managed to have a new Chromebook worse than the five year old one I bought previously), and more online research from more advanced classes makes phones necessary