- Title: The Effects of School Phone Bans: National Evidence from Lockable Pouches
- Authors: Hunt Allcott et al.
- Access the original paper here
- Watch a video overview:
Paper summary
Phone restrictions in schools are spreading fast, but hard evidence has been thin. This US study evaluates one stringent version: lockable pouches (the Yondr brand) that students seal their phones into for the whole school day. Using nationwide data on middle and high schools and a staggered difference-in-differences design, the researchers combined GPS phone signals, standardised test scores, attendance, discipline records and student surveys. Adopting pouches sharply cut in-school phone use, with teachers reporting personal phone use in class falling from 61% to 13%. Yet the wider effects were modest. Disciplinary incidents rose and student well-being dipped in the first year, then well-being turned positive and discipline settled. Average test scores barely moved, with small gains in high school maths offset by small dips in middle schools. Attendance and bullying were unaffected.
If teachers remember one thing from this study, it should be…
Locking phones away reliably and sharply cuts their use in school. But on its own, that did little for average test scores, attendance or bullying, and the first year brought more discipline incidents and a dip in well-being before it recovered. Manage expectations, and manage the transition.
***Paper Deep Dive***
What are the key technical terms used in the paper?
- Lockable pouches: magnetically sealed cases that students lock their phones in all day; the study uses Yondr.
- Staggered difference-in-differences: comparing schools that adopted pouches with similar schools that didn’t, to estimate a causal effect.
- GPS pings: location signals from phones, used as a rough proxy for phone use.
What are the characteristics of the participants in the study?
A school-level study of US public middle and high schools. Yondr records covered 4,607 adopting schools; the test-score analysis used roughly 1,341 middle schools and 656 high schools (mostly adopting 2023–2025), compared against similar never-adopting schools. A national teacher survey drew around 108,000 responses.
What does this paper add to the current field of research?
Evidence on school phone bans has been small, mixed and mostly non-US (positive in England, Brazil and Norway; null in Sweden). This is the first large-scale, nationwide US study of a stringent, physically enforced restriction, pairing independent measures of actual phone use with test scores, discipline and well-being.
What are the key implications for teachers in the classroom?
- Plan for a bumpy start, not instant calm. In the first year after pouches came in, recorded discipline incidents rose (roughly a 16% rise in suspensions in the adoption year), and students’ reported well-being fell, before both settled, and well-being turned positive in later years. If your school is implementing a strict phone policy, treat early friction as a predictable adjustment phase rather than as proof that the policy has failed. Brief staff to enforce consistently and calmly, warn families that the first term may feel harder, and hold the line long enough to reach the smoother period that the data points to.
- Don’t sell it as a grades booster. Across the whole sample, the effect on test scores was essentially zero. If you want buy-in from students, parents or colleagues, anchor the case in attention, behaviour and a calmer social climate, not promised jumps in attainment. Over-promising academic gains sets the policy up to look like a failure when results come in flat.
- The pouch cuts phone use; what replaces it decides the rest. Locking phones away reliably reduced use, but the benefit depended on what students did instead. The authors note that some students may switch to other off-task behaviour, or to laptops and tablets. Pair any restriction with a plan for the newly freed time and attention: structured break-time options, clear classroom routines, and an eye on other screens, rather than assuming the pouch alone fixes distraction.
- Expect age to matter, and give younger students more scaffolding. High schools saw small positive effects, concentrated in maths, while middle schools saw small negative effects. Younger students’ weaker impulse control may mean a removed phone simply gets replaced by other disruptions. For younger year groups in particular, don’t assume that taking the phone away improves focus on its own. Invest more in self-regulation support and genuinely engaging alternatives.
Why might teachers exercise caution before applying these findings in their classroom?
This is a working paper, not yet peer-reviewed. Though carefully matched, adopting and comparison schools differed at baseline, so this is quasi-experimental rather than a randomised trial. Follow-up runs at most three years, data are school-level, not individual, and the well-being survey covers a small, self-selected set of schools.
What is a single quote that summarises the key findings from the paper?
Average effects on standardized test scores are close to zero and precisely estimated, with similarly small and null effects on attendance, classroom attention, and perceived online bullying.
