Thirty states now limit or ban cellphone use in classrooms, and teachers are noticing children paying attention to their lessons again. But it’s not clear whether this policy — unpopular with students and a headache for teachers to enforce — makes an academic difference.
If student achievement goes up after a cellphone ban, it’s tough to know if the ban was the reason. Some other change in math or reading instruction might have caused the improvement. Or maybe the state assessment became easier to pass. Imagine if politicians required all students to wear striped shirts and test scores rose. Few would really think that stripes made kids smarter.
Two researchers from the University of Rochester and RAND, a nonprofit research organization, figured out a clever way to tackle this question by taking advantage of cellphone activity data in one large school district in Florida, which in 2023 became the first state to institute school cellphone restrictions. The researchers compared schools that had high cellphone activity before the ban with those that had low cellphone usage to see if the ban made a bigger difference for schools that had high usage.
Indeed, it did.
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Student test scores rose a bit more in high cellphone usage schools two years after the ban compared with schools that had lower cellphone usage to start. Students were also attending school more regularly.
The policy also came with a troubling side effect. The cellphone bans led to a significant increase in student suspensions in the first year, especially among Black students. But disciplinary actions declined during the second year.
“Cellphone bans are not a silver bullet,” said David Figlio, an economist at the University of Rochester and one of the study’s co-authors. “But they seem to be helping kids. They’re attending school more, and they’re performing a bit better on tests.”
Figlio said he was “worried” about the short-term 16 percent increase in suspensions for Black students. What’s unclear from this data analysis is whether Black students were more likely to violate the new cellphone rules, or whether teachers were more likely to single out Black students for punishment. It’s also unclear from these administrative behavior records if students were first given warnings or lighter punishments before they were suspended.
The data suggest that students adjusted to the new rules. A year later, student suspensions, including those of Black students, fell back to what they had been before the cellphone ban.
“What we observe is a rocky start,” Figlio added. “There was a lot of discipline.”
The study, “The Impact of Cellphone Bans in Schools on Student Outcomes: Evidence from Florida,” is a draft working paper and has not been peer-reviewed. It was slated to be circulated by the National Bureau of Economic Research on Oct. 20 and the authors shared a draft with me in advance. Figlio and his co-author Umut Özek at RAND believe it is the first study to show a causal connection between cellphone bans and learning rather than just a correlation.
The academic gains from the cellphone ban were small, less than a percentile point, on average. That’s the equivalent of moving from the 50th percentile on math and reading tests (in the middle) to the 51st percentile (still close to the middle), and this small gain did not emerge until the second year for most students. The academic benefits were strongest for middle schoolers, white students, Hispanic students and male students. The academic gains for Black students and female students were not statistically significant.
Related: Suspended for…what?
I was surprised to learn that there is data on student cellphone use in school. The authors of this study used information from Advan Research Corp., which collects and analyzes data from mobile phones around the world for business purposes, such as figuring out how many people visit a particular retail store. The researchers were able to obtain this data for schools in one Florida school district and estimate how many students were on their cellphones before and after the ban went into effect between the hours of 9 a.m. and 1 p.m.
The data showed that more than 60 percent of middle schoolers, on average, were on their phones at least once during the school day before the 2023 ban in this particular Florida district, which was not named but described as one of the 10 largest districts in the country. (Five of the nation’s 10 largest school districts are in Florida.) After the ban, that fell in half to 30 percent of middle schoolers in the first year and down to 25 percent in the second year.
Elementary school students were less likely to be on cellphones to start with and their in-school usage fell from about 25 percent of students before the ban to 15 percent after the ban. More than 45 percent of high schoolers were on their phones before the ban and that fell to about 10 percent afterwards.
Average daily smartphone visits in schools, by year and grade level
Florida did not enact a complete cellphone ban in 2023, but imposed severe restrictions. Those restrictions were tightened in 2025 and that additional tightening was not studied in this paper.
Anti-cellphone policies have become increasingly popular since the pandemic, largely based on our collective adult gut hunches that kids are not learning well when they are consumed by TikTok and SnapChat.
This is perhaps a rare case in public policy, Figlio said, where the “data back up the hunches.”
Contact staff writer Jill Barshay at 212-678-3595, jillbarshay.35 on Signal, or barshay@hechingerreport.org.
This story about cellphone bans was produced by The Hechinger Report, a nonprofit, independent news organization focused on inequality and innovation in education. Sign up for Proof Points and other Hechinger newsletters.
