The important thing in the article is that this ban concerns phone usage during breaks and lunch. Phones in classes were already forbidden long time ago.
> [Jean-Michel Blanquer, the French education minister] said some education establishments already prohibited pupils from using their mobiles.
> At another school, Mathilde, 12, said: “It’s ridiculous. At my school, we don’t use them in class or during recess, so what’s the problem? If anyone’s caught using one in the toilets or at lunchtime, the phones are confiscated immediately and the person is given detention.”
This is certainly an important aspect of the ban, but also relevant is that this is a centrally-issued (unfunded) mandate rather than policy set on a school or district basis.