Many schools now ban smartphones. The idea is simple: no phones, more study. But the newest research says the answer is not so simple. In April 2026, an NBER working paper studied U.S. schools that used lockable phone pouches. The policy clearly cut phone use during the school day. However, average test scores stayed almost the same, and the study found little change in attendance, classroom attention, or online bullying. (nber.org)

The first year was even surprising. After schools started the pouch system, discipline problems went up and students felt worse. Later, the picture changed. By the third year, discipline returned to earlier levels, and student well-being became better than before. The study also found a small math gain in high school, but a small drop in middle school test scores. So a ban may help some students, but not all students in the same way. (nber.org)

Research from Brazil in 2026 also shows a mixed story. In Rio de Janeiro, a stricter school phone ban lowered in-school phone use and improved test scores in schools that had weak rules before. A related Stanford report on Brazil said 83% of students felt they paid more attention in class after the national law, but many students also reported more boredom, and many teachers saw more anxiety. (web.stanford.edu)

Big international reports give one more lesson. OECD says nearly one in three students in OECD countries gets distracted by using digital devices in class. It also says phone bans can work, but only if schools really enforce them. UNESCO reported in 2026 that 114 education systems now have national phone bans, yet it also warned that students still need to learn how to live with technology, not only without it. (oecd.org)

So, are school smartphone bans effective? Yes, but only partly. They can reduce phone use. They may bring benefits after schools and students adjust. But a ban alone is not a magic answer for grades or behavior. Clear rules, teacher support, and lessons about healthy phone use are important too. (nber.org)