Mexico's rule, in force since 3 November 2026, keeps personal phones out of basic-education classrooms for the whole school day unless a teacher has planned their use. Exceptions cover emergencies, disability and health needs. It sets no specific sanctions. Evidence that such rules help is thin: English studies link bans to better exam results, not to better wellbeing.
What does the rule actually say?
The measure is Acuerdo 09/09/26 of the Secretaría de Educación Pública (SEP), published in the Diario Oficial de la Federación on 22 September 2026. It entered into force on 3 November 2026. For initial, preschool, primary and secondary education, devices are restricted "durante toda la jornada escolar", and may be used only "para fines educativos previamente programados".
The text allows use "en casos de emergencias personales, por motivos de discapacidad, accesibilidad, inclusión" and for health needs. The SEP's bulletin 309 says the rule applies "en todas las escuelas públicas y particulares de Educación Básica", with a carve-out for activities "previamente planeadas y orientadas por las y los docentes".
The most surprising feature is what the rule leaves out. Press coverage called it a ban (see Expansión), but the decree puts its formative approach "por encima de un enfoque exclusivamente restrictivo o punitivo". It sets no specific sanctions, so enforcement is left to the education authorities and schools, with the emphasis on prevention.
Who is covered, and who decides the details?
Basic education gets the uniform rule. Upper secondary schools (media superior) get a menu instead: each school sets its policy through an assembly, choosing among options that run from keeping devices in the classroom to setting times and areas, to no use all day, to scheduled use. Universities are encouraged to promote responsible use, and their autonomy is respected.
Implementation is slow and local. The Presidency's communiqué said schools would have "un plazo de 30 días para realizar asambleas informativas". According to the decree's transitional articles, as summarised, states must issue or align their own instruments within 180 natural days, and the rule is to be reviewed every six months. Expansión reported the same absence of sanctions and the six-monthly reviews.
The government says teachers back it. The SEP reported that "más del 81 por ciento manifestó estar a favor de establecer reglas y lineamientos" in a consultation, which Claudia Sheinbaum described as "una consulta con las y los maestros de todos los niveles educativos". Education Secretary Mario Delgado put the aim this way: "Queremos que la escuela siga siendo un encuentro humano y vital".
What does the evidence say about bans?
Mexico joins a crowd. UNESCO's Global Education Monitoring Report counts 114 education systems, 58%, with a national ban. In June 2023 fewer than one in four (24%) had one. The count has risen fast. Adoption has outrun proof.
The strongest case for bans is academic. Louis-Philippe Beland and Richard Murphy studied English schools whose own decisions to ban phones varied over time. They found that "student performance in high stakes exams significantly increases post ban", and that the gains were "driven by the lowestachieving students". The paper is a 2015 discussion paper from the London School of Economics, now more than a decade old.
The case for caution comes from a 2025 study by Goodyear and colleagues in The Lancet Regional Health - Europe, summarised on the University of Birmingham research portal. It surveyed 1,227 adolescents aged 12 to 15 in 30 English secondary schools, 20 with restrictive policies and 10 with permissive ones. On mean wellbeing it found "no evidence of a difference between groups". Pupils in restrictive schools reported about 0.67 hours less phone use and 0.54 hours less social media use during school time, but no difference over a whole weekday or weekend. The authors concluded that "these policies require further development".
The two studies measure different things. One looks at exams, the other at wellbeing, and the second is a snapshot that shows association, not cause. Defenders of bans could reply that Goodyear did not measure classroom attention or results. That reply is fair. It also means the case for Mexico's rule rests on the single exam study cited here, more than a decade old and from another country.
Why is Mill relevant to a rule for children?
John Stuart Mill's On Liberty (1859) is the standard defence of leaving people alone. Its principle is that power may be used against a person's will only to prevent harm to others. Mill fenced that principle at the outset: "this doctrine is meant to apply only to human beings in the maturity of their faculties". Children are outside it: those who need care from others, he wrote, "must be protected against their own actions".
That makes the basic-education rule easy to defend on Mill's own ground. Nobody can invoke On Liberty for a nine-year-old's right to a phone in the playground. What remains is an empirical matter, whether the protection works, and the exam evidence is a decade old.
The test bites harder at the other end. Mill drew his line at maturity, which he allowed the law to fix by age. Our reading is that this makes the upper-secondary menu the closer fit to his adult case: older teenagers, a decision taken by an assembly of the school community, rather than a rule handed down.
Does Durkheim explain the other side?
Partly. Émile Durkheim's Moral Education, in the usual summary, treats discipline and attachment to the group as elements of moral education that the school supplies. On that reading a phone-free day is less a restriction on individuals than a claim about what school is for: a shared setting where attention is owed to the people in the room. Delgado's phrase about school remaining "un encuentro humano y vital" is close to that idea. The idea strains in one place: Mexico's rule declines to punish, which makes it a gentler claim of authority.
What is the strongest objection?
The objection is that a rule without sanctions is a request. Expansión reported the same absence of sanctions. Our reading of the sceptic's case is that a decree which leaves penalties and local detail to schools and states asks for compliance without enforcing it, and that results are likely to differ from school to school.
The reply from the government is the formative approach itself, and the 81% of consulted teachers who wanted rules. We think the objection has force but misses the more important point. The design at least leaves something to measure: schools set expectations and the rule is reviewed every six months. Our position is that the no-sanctions design is defensible, provided Mexico measures what happens.
That is the condition most at risk. The decree builds in six-monthly reviews, but the evidence cited here shows bans spreading faster than tests of their effects. Watch for the states' own instruments, due within 180 days, and for whether the first review reports exam results or attention, not just compliance.
Where to read next
- The decree in the Diario Oficial de la Federación, the primary text.
- SEP bulletin 309, the ministry's account of the rule and the teacher consultation.
- The Goodyear abstract and the Beland and Murphy paper, for the two sides of the evidence.
- Mill's On Liberty, chapter 1, for the passage on children.