National study: Cellphone bans cut in‑school use but show little short‑term benefit

Students really are using their phones less when schools lock them up. That part looks real. The surprise is that the bigger promised payoff — better test scores, attendance, behavior, and mental health right away — mostly did not show up in the national data. ### What actually came out? A new NBER working paper from researchers at Stanford, Duke, the University of Michigan, and the University of Pennsylvania looked at lockable phone-pouch bans in U.S. schools. They used data from the pouch company Yondr, plus surveys, GPS phone-location data, test scores, attendance records, and discipline data. The sample was huge — roughly 40,000 to 43,000 middle and high schools, with a closer outcome analysis on about 4,600 schools. (nber.org) ### Why does the pouch part matter? Because a lot of earlier “phone bans” were soft bans. Students were told to keep phones in backpacks or out of sight, but enforcement was uneven. This study focused on schools using Yondr-style lockable pouches, where students keep the phone with them but cannot open the pouch until the end of the day. That makes the policy much easier to measure — and turns out to be a cleaner test of whether strict restrictions change anything. (nber.org) ### Did the bans at least cut phone use? Yes — sharply. Teacher reports showed classroom phone use dropping from about 61% of students to 13% over three years in states with bans, and the researchers also used GPS pings to confirm that in-school phone activity fell after pouch adoption. So on the narrow question of “Can schools get phones out of kids’ hands during the day?” the answer is basically yes. (wusf.org) ### So why are people calling the results mixed? Because the academic and behavioral gains were mostly tiny or absent in the short run. Average effects on test scores were “close to zero.” Attendance barely moved. The study also found little evidence of improvement in attention or perceived cyberbullying overall. That is the part that cuts against the political sales pitch, which often treated phone bans as a quick fix for a bunch of school problems at once. (nber.org) ### Did anything get worse at first? A little, yes. In the first year after schools adopted pouches, disciplinary incidents rose and student well-being fell. The authors read that as short-term disruption — which makes intuitive sense. If you suddenly remove a habit students rely on all day, some friction is going to show up before routines reset. By later years, those discipline effects faded and well-being turned positive. (nber.org) ### Were there any bright spots? Some. High schools showed modest positive effects, especially in math, while middle schools showed small negative effects on average. That split matters because it suggests “phone bans” may not be one policy with one result. A 17-year-old and a 12-year-old are not bringing the same habits, temptations, or classroom dynamics into school. (nber.org) ### How does this fit with older research? It complicates it, not overturns it. A separate Florida study had found test-score gains two years after a school ban, especially for students who struggled more before the policy. So the new national paper does not say bans never help. It says the average short-term national effect from strict pouch policies is much weaker than advocates often imply. (nber.org) ### What’s the real takeaway here? Phone bans look better as an environment policy than as an instant academic intervention. They can make classrooms feel calmer and reduce visible distraction. But calmer halls do not automatically become higher scores by the next testing cycle. The bottom line is simple — schools can remove phones, but they still have to do the harder work of teaching, discipline, and student support. (nbcnews.com)