10 studies from LSE, NBER, JAMA, The Lancet, and Nature Human Behaviour. These are the primary-source citations behind every policy debate, news article, and advocacy campaign on this topic.
A survey of 91 schools across four English cities (130,000 pupils) found that banning mobile phones raised test scores by 6.4% overall, with low-achieving students gaining 14.23% — equivalent to an extra week of schooling per year.
The foundational causal study in the field. Every subsequent paper, news article, and policy brief on phone bans traces its numbers back to this one.
The first large-scale US district-level study. Two years after a full-day ban in a large Florida urban district, test scores rose (+1.1 percentile in high-phone-use schools), unexcused absences fell, and phone usage dropped roughly two-thirds. Year 1 saw a suspension spike among Black male students that subsided by Year 2.
The most rigorous recent US study with multi-year longitudinal data. Cited in every major 2025–26 policy debate and covered by Chalkbeat, Hechinger, and EdWeek.
Using synthetic control methodology on PISA data, the study found that after bans in Galicia and Castilla-La Mancha (2015), student PISA scores improved by ~10 points in math and 12 in science — equivalent to 0.6–1 year of extra learning — and bullying incidence fell 9.5–18%.
The first study to measure both academic and bullying outcomes of a regional school phone ban using quasi-experimental methods. International natural-experiment evidence that complements the UK and US data.
Analyzed nationally representative surveys of more than 506,820 U.S. adolescents in grades 8–12. Depressive symptoms, suicide-related outcomes, and suicide rates increased sharply after 2010 — especially among girls — correlating with the rise of smartphone and social media use.
The empirical anchor for the Haidt/Twenge thesis. Referenced in nearly every legislative hearing, surgeon general report, and state policy document on youth mental health.
Synthesizes hundreds of studies to argue that the shift to smartphone-based childhood between 2010–2015 caused a global epidemic of adolescent anxiety, depression, and self-harm. Calls for phone-free schools as a primary systemic intervention, alongside delaying smartphones until high school and social media until age 16.
52+ consecutive weeks on the NYT nonfiction bestseller list. Widely credited as the cultural catalyst that converted the phone-free-schools movement from niche advocacy to mainstream policy.
Trajectories of addictive screen use are significantly associated with suicidal behaviors, ideation, and deteriorating mental health outcomes in U.S. youth. One of the strongest prospective longitudinal links yet between addictive phone use and self-harm.
Published in JAMA — one of medicine's most prestigious journals — lending major clinical authority to the argument that compulsive phone use is a youth mental health crisis.
Quantified actual in-school smartphone use patterns among U.S. adolescents using passive sensing data. Found substantial unauthorized usage during instructional time even in schools with nominal restriction policies — supporting the case for stronger enforcement mechanisms.
Provides observational baseline data. If you want to know whether "bans" in name actually work as written, this is the study that quantifies the gap.
A cross-sectional study of 1,227 adolescents in 30 UK schools found no evidence that restrictive phone policies (versus permissive policies) improved mental wellbeing, sleep, physical activity, or academic attainment. Students compensated by using phones more after school — total daily usage was unchanged.
The principal counter-study to the pro-ban consensus. Published in The Lancet — we include it because a research page that only shows supporting evidence isn't a research page, it's a sales pitch.
Using specification curve analysis on large-scale datasets (355,358 participants), the study found the association between digital technology use and adolescent well-being is negative but small, explaining at most 0.4% of variation — comparable to the effect of wearing glasses or eating potatoes.
The leading methodological critique of the Haidt/Twenge paradigm. The go-to citation for "the evidence is weak" arguments. If you're reading Anxious Generation, you should also read this.
A nationally representative survey of 1,490 K-12 public school principals (December 2024) found that more than half said cell phones hurt academic performance. Schools with all-day bans reported the largest behavioral and focus improvements.
The federal government's own data. Especially persuasive for policy audiences because it comes from school leaders — not researchers — in every state.