Around the world, school smartphones are no longer considered a matter of teacher preference or student etiquette. It is being written into law, guidance and national school policy. Estimates show that in the U.S., at least 37 states and the District of Columbia now require districts to ban or restrict student cell phone use, though the strictness of those rules varies widely — from class time limits to bell to bell. England is preparing a legal school mobile phone ban, while the Netherlands has already pushed phones out of secondary, primary and special education classrooms. Australia also has bans on all public schools, while South Korea has imposed a nationwide classroom ban from March 2026. And UNESCO says 114 education systems, representing 58 percent of countries worldwide, now have national school phone bans. The proposition is disarmingly simple: remove the phone, and schools can restore focus, discipline, face-to-face interaction, mental well-being and academic rigor. However, the latest US evidence suggests that the political commitment is not fully committed. A National Bureau of Economic Research (NBER) working paper, titled Effects of school phone bans: National evidence from lockable pouches Findings show that while such restrictions substantially reduce student phone use, they do not lead to broader improvements in test scores, attendance, classroom attention or online bullying. The first year, indeed, comes with its complications: an increase in disciplinary incidents and a decrease in student well-being, before some of these effects begin to fade.This is no small warning, as cell phone bans become one of the major education policy initiatives in the US in 2025-26. Cell phone bans become a major trend in US education policy in 2025-26. Education Week reported that at least 37 states and Washington, D.C., require districts to ban or restrict student cell phone use in schools. The evidence is now asking a slower, less simple question: What exactly do these restrictions do, what do they simply suppress, and what new frictions do they create within the school day? Here’s what the study found.
Gone are the phones, at least in measurable terms
On the narrow question of whether lockable pouches actually reduce phone use, the study is fairly inconclusive. They did. Whatever else one might say about the policy, it was not some decorative rule that was put up on a notice board and quietly ignored by teenagers. It changed the school day in a measurable way.The researchers tracked it in two ways. First, they looked at GPS-based phone activity on school campuses during school hours. Second, they used teacher reports of how often students were using phones in class for personal reasons. Both initiatives moved in the same direction. GPS pings dropped significantly after schools adopted the pouches, with the paper finding a nearly 30% drop in total GPS pings by the third year after adoption. The authors are wisely cautious here: GPS data is an imperfect proxy, since it may include phones from adults on campus and because phones may generate pings even when they are not actively being used. But despite these caveats, the signal is hard to dismiss. The instruments were silent.Teacher reports make this point even more blunt. The share of students using phones in class for personal reasons dropped from 61% to 13% after adopting Yondr. This is no small improvement. It’s the difference between a classroom where phone use is the norm and one where it’s pushed to the fringes. So, at the most basic level, the ban worked. He snatched the phone from the student’s hand. The hard question, as the rest of the study shows, is whether attention, learning, and well-being moved to occupy the empty space of the phone.
Attention was not magically restored.
This is where the story gets complicated. If phones are the villain, removing them should have a clear advantage in classroom focus. This is not found in the study. Student-reported classroom attention showed no broadly measurable improvement after adopting the pouch. Indeed, the paper records a negative and statistically significant estimate in the second year after adoption, although the authors caution that this particular result should be interpreted with caution because of possible differences in preexisting trends in the survey sample. However, the larger point is hard to miss: removing the phone does not automatically create a more attentive classroom.Now, this is important because attention is the emotional core of the phone ban argument. Parents, teachers, and policymakers typically don’t just discuss device management. They’re debating whether schools can reclaim the mental space that phones have colonized. This study suggests that the answer is more counterintuitive. Students may stop looking at the phone, but that doesn’t mean their attention will obediently shift to algebra, history, or the teacher’s voice. It can move elsewhere—to peers, laptops, boredom, resistance, or simply the old teenage art of inattention.
Test scores remained stubbornly flat.
The study found that, on average, phone pouches did not produce meaningful educational benefits. In the first three years after adoption, the average effect on test scores was close to zero. The authors say they could rule out improvements larger than about 0.008 student-level standard deviations, which is another way of saying that any broad cognitive gain was very small, if it existed at all.This finding is important because academic rigor is one of the strongest public arguments for banning school phones. The logic is straightforward: fewer phones, fewer distractions, better learning. But the NBER paper suggests that success doesn’t flow so neatly. Test scores, especially on scales, are difficult to change. Banning the phone may eliminate one source of distraction, but it does not automatically repair poor instruction, absenteeism, poor motivation, poor classroom routines, or many of the other forces that shape learning.
Discipline got worse before it got better.
One of the fastest short-term results is on discipline. Disciplinary incidents increased in the first year after adoption. The increase was about 0.03 student-level standard deviations, which corresponds to about a 16% increase in suspension rates, including in-school and out-of-school suspensions, the paper says. However, the effect faded in later years.This is not necessarily evidence that students are more misbehaving. The study offers two possible explanations. First, a new rule creates new opportunities for infringement. Students who were not previously disciplined may now be disciplined for non-compliance with the telephone policy. Second, students can change other disruptive behaviors from the phone, including more peer interactions that can escalate into conflict. Either way, the story of the first year is not clear. The phone disappears, but the school day doesn’t immediately calm down. It may, for a while, be more competitive.
Well-being first sank, then recovered.
The pursuit of well-being is perhaps the most human of all. Student-reported mental well-being declined in the year of adoption, before rebounding and becoming positive by the second year post-adoption. This paper estimates an initial decrease of approximately 0.2 student-level standard deviations, followed by a subsequent increase of 0.16 standard deviations.This makes intuitive sense. For students, the phone ban isn’t just a classroom management rule. It changes the routines, autonomy, social signaling, communication with parents, and small rituals that school life goes through. So the first reaction may be irritation, anxiety, or resistance. However, over time, students can adapt. Less constant connectivity can also start to help. But the sequence is important: the benefit, where it appears, is not immediate. The first year can feel less like an adjustment and more like a comeback.If the policy expected students to engage more with the school as an institution, attendance does not reflect this. The study found effects on attendance rates that were close to zero. This may rule out an improvement of more than 0.056 percentage points. Against an average attendance rate of 93%, this is a small movement – less than 0.1%.This undercuts another optimistic hypothesis: that a phone-free school day might make students more connected to school and therefore more likely to attend. Attendance, like achievement, appears to be governed by a broader ecology of factors. Phones may be part of school disengagement, but they are not the whole machinery of it.
What’s left after the phone goes away?
The lesson, then, is not that schools should hand over the classroom to the smartphone, but that they should not mistake the management of a device for the repair of educational culture. U.S. evidence suggests that stricter restrictions may do the first job better: phones become less visible, casual classroom use declines, and the silent tyranny of the screen in every pocket takes up the school day.But the big claims made in the name of phone ban are not true. Attention does not return simply because a phone is turned off, and learning does not improve because a source of distraction is made difficult to access. An anxious classroom can remain anxious, only with the purpose of anxiety changing.This doesn’t make restrictions meaningless, it just makes them more trivial. In schools where phones have colonized the day, the ban may create a necessary boundary. But once the pouch clicks, the hard work begins: teaching that can sustain attention, routines that students trust, counseling that is more than a brochure word, peer cultures that don’t just divert noise, and classrooms that give young people a reason to be mentally present.
