Stanford University: School cell phone bans deliver benefits – but not right away. Really!

First of all, the term "cell phone" sounds so 1980s/1990s if not 1970s!

Up to what grade should smartphones be banned? All grades?

Why are smartphones not integrated into school curricula beginning from a certain age of the students?

Plus, there is a lot of alarmism and hysteria about the use of smartphones going on! This akin e.g. to the introduction of video and video games!

School cell phone bans deliver benefits – but not right away | Stanford Report "New research reveals that while bans aren’t an instant panacea for problems in U.S. classrooms, schools can achieve positive outcomes with persistence."