In a public school in southern Brazil, the start of each lesson now begins with a small ritual: students file past a cardboard box at the teacher’s desk and drop their smartphones inside. The Portuguese teacher, Geneci Ribeiro Padilha, watches the familiar reluctance. “Many students still resist, they want to use the device,” she says, “but I consider this a first important step.” Her classroom is one of thousands adapting to a federal law that, for a year now, has restricted mobile phones during lessons, breaks and intervals across the country. The box, unremarkable as an object, has become a quiet marker of a broader shift in the way adults are redrawing the boundaries between childhood and the digital world.

That shift is now measurable. New data from Brazil’s national statistics institute shows that, for the first time, the proportion of children aged 10 to 13 who own a mobile phone has fallen, from 56.7% in 2024 to 55.2% in 2025. It was the only age group to register a decline. Among those without a device, the most cited reason was concern for privacy or safety, a motivation that has nearly doubled across the general population in a single year. In schools, the effects of the ban are being tracked closely: 95% of public-school teachers report improved concentration, 97% of headteachers say student participation has risen, and 88% link the restriction to a reduction in cyberbullying. The classroom box, it seems, is doing more than just storing hardware.

Viewed from Buenos Aires, the Brazilian numbers resonate with a parallel anxiety. Argentina’s public prosecutor’s office for children and the national paediatric society have just launched a campaign warning that more than half of children and adolescents aged 9 to 17 are already using artificial intelligence, and many are turning to it for emotional support. “AI gives answers, but it does not accompany,” the campaign’s message runs. “It is a virtual assistant, not therapy.” The concern is that platforms designed to simulate empathy are displacing human interlocutors precisely when young people are most vulnerable. In Egypt, the government has taken a different route, rolling out a “child chip” service that allows parents to block social media and harmful content on their children’s phones, while a proposed law would set a minimum age for social media use. Officials in Cairo describe the measure as a tool to help families, not a substitute for their vigilance.

These interventions sit against a backdrop of near-universal connectivity. In Brazil, 95% of households now have internet access, and 90.5% of the population aged 10 and above are online, the highest level ever recorded. Indonesia, meanwhile, is pushing digitalisation deeper into its most remote regions, aiming to connect over 16,000 schools to the internet this year while also training teachers in artificial intelligence and aquaponics. The paradox is stark: as governments pour resources into wiring up classrooms, they are simultaneously building fences around the devices that deliver that connectivity. In Jakarta, officials speak of “strengthening digital learning” in the same breath as they acknowledge the need to protect children from the very platforms that learning depends on.

What emerges is not a simple retreat from technology but a recalibration of its place in young lives. The cardboard box in that Brazilian classroom is not a rejection of the digital; it is a temporary boundary, a way to carve out a space where the teacher’s voice is not competing with a stream of notifications. The Egyptian child chip, the Argentine campaign, the Indonesian teacher training in AI ethics—all are attempts to negotiate a relationship that is still being invented. For now, the most potent symbol of that negotiation may be the sight of a teenager, at the start of a school day, placing a phone into a box and walking to a desk, hands empty, to begin again.