According to my daughter, the Ontario ban had little effect on her high school. Before the ban, some teachers allowed phones, some didn't. After the ban, some teachers allow phones and some don't. Many teachers use internet resources in their classroom, and phones are how the students access those. There are Chromebooks available, but not enough for everybody, and they are in rough shape.

And the other daughter's middle school is still the same as before the ban. They previously had a ban stricter than the provincial government's mandate so nothing changed.