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The Educational Impacts of School Phone Bans: Evidence from Brazil

Lichand et al. 2026 · natural experiment (no random assignment) · touches 2 claims · used in 1 attack · used in 1 correction to our notes

Which beliefs it touches

C6 Phones in lessons backs it up
Rio de Janeiro city-wide ban DiD (working paper): maths+Portuguese index +0.061 SD after the school-wide ban in schools without prior strict rules vs already-strict schools; classroom-only phase ns; gains mainly among low achievers. C6 kill-condition test survived 2026-10-11.
C36 Phone bans and lower achievers backs it up
Rio city-wide ban DiD (preprint): authors report gains concentrated at the bottom of the pre-ban achievement distribution. Full-sample school-wide quartile estimates 0.080 (SE 0.046, p < .10), 0.040, 0.010, 0.003; matched-sample equivalents were not significant.