Like it or not, smartphones and the internet are now a part of everyday life. Digital literacy is now as important as traditional literacy. Pretending that this shift has not happened, because education systems cannot adapt to it, is absurd.
The problems that are claimed to be caused by smartphones in class seem to be more down to to a lack of discipline and engagement. I went to school before any kind of mobile phone was a thing. There were still plenty of potential ways for students to goof off, yet teachers by and large managed to keep us focused and behaving.