Hi, Ken! Thanks very much for the report on the study. Published this year, it is presented as "The first study in the world to look at school phone rules alongside measures of pupil health and education", at least peer-reviewed. So it's nice that we have a first conclusion on the topic. 

As the law is recent in Brazil as a whole (states were already regulating it sparsely), *we only have perceptions of students and teachers, and specialists talk*, no "clear-data" studies; but I would bet one to be conducted here still 2025 or beginning of 2026, with data collected orderly and systematically. And then, when it comes, I'll try to remember to post that here, to share the (same or another) conclusion being outlined from another sources too. Thanks very much for contributing with my knowledge (in a subject I appreciate) and maybe other listeners of it too.