Should smartphones be banned in K-12 schools nationwide?

I have taught for 14 years, and the phone is the single biggest change in my classroom, bigger than any curriculum rewrite. UNESCO's 2023 Global Education Monitoring Report found it can take students up to 20 minutes to refocus after a single notification, which means one buzz can erase a third of a class period. Florida's 2023 law banning phones during instructional time was not some authoritarian whim, it was a response to teachers begging for backup. My students are good kids, and they still cannot resist a screen engineered by thousand-person teams to be irresistible. A nationwide ban would do what I cannot do alone: make the classroom a place where attention is the default instead of the exception.