School cellphone bans are sweeping the country, but new research shows that simply locking devices away might not automatically boost grades. While educators report calmer classrooms, the actual impact on test scores depends heavily on how strictly these policies are enforced.
What Happened
Over the past year, schools across the United States have rushed to restrict student mobile devices. According to a report by ABC News, roughly two-thirds of U.S. states have adopted some form of school cellphone restriction. Districts like Denver Public Schools have enacted unanimous, district-wide, all-day bans, while others rely on local school-by-school rules.
The academic results of these policies are highly mixed. A major national study published by the National Bureau of Economic Research looked at more than 40,000 schools using Yondr magnetic locking pouches. The study found that while the pouches reduced phone use, they had almost no impact on student test scores, attendance, or online bullying.
This flat result contrasts with other data. A separate NBER study on phone bans in Rio de Janeiro, Brazil found that restricting phone use in middle schools improved test scores by 0.06 standard deviations. Meanwhile, researchers studying Florida’s statewide cellphone ban have observed small academic gains and fewer absences when schools enforce strict, all-day bans rather than passive honor systems.
The Bigger Picture
The debate over cellphones comes during a decade-long decline in academic performance. As reported by Time Magazine, U.S. reading scores in 2025 were down roughly 0.6 grades compared to 2015. While the National Assessment of Educational Progress shows that reading scores for 9-year-olds improved by four points between 2022 and 2025, scores for 13-year-olds have plateaued and remain below pre-pandemic levels.
To fight this academic slide, many schools are turning to technology policies. But experts argue that passive rules, such as asking students to place phones in a basket at the front of the room, fail because they rely on voluntary compliance from children. According to commentary from education expert Aron Boxer, these half-measures do not work because smartphones are specifically engineered to hijack the developing brain's reward system.
When policies are strictly enforced, schools see results beyond test scores. According to FutureEd, student well-being initially dips when a ban is introduced but steadily improves over time. Teachers report that classrooms become significantly quieter and students engage in more face-to-face social connections.
What This Means for Families
For parents, the research suggests that inconsistent rules around screens can hinder a child's development. Research shows that inconsistent rules and threats without consequences breed oppositional behavior. If schools are holding the line, parents must reinforce those boundaries at home.
Technology itself is not the enemy. As seen with tools like Duolingo's new learning features, structured screen time can build critical thinking. The issue is not the presence of devices, but the lack of active, consistent adult authority over when and how children use them.
What You Can Do
Parents can take several practical steps. First, establish device-free zones at home. Mimic successful school policies by keeping phones completely out of bedrooms and study spaces, rather than relying on an honor system.
Second, support strict school rules. Avoid trying to bypass school rules by texting your child during the day, and contact the front office for emergency messages as recommended by school administrators.
Finally, consider delaying smartphones until age 14 and social media until age 16 to help your child build executive function and focus.