In this Policy Article, Alp Sungu and colleagues report on a large-scale randomized controlled trial evaluating the impacts of classroom phone restrictions on student outcomes in India. The findings show that restricting phone use can support learning, particularly among lower-performing students. Amidst growing concerns about smartphones’ effects on learning, mental health, and peer relationships, phone bans are being increasingly adopted in schools worldwide. However, large-scale experimental evidence supporting whether these bans improve learning or social outcomes is lacking. To address this gap, Sungu et al. performed a randomized controlled trial involving 16,683 students across 10 higher education institutions in Odisha, India – a state where smartphone ownership and use among youth aged 15 to 29 exceeds 70%. The authors measured academic performance, attitudes toward phone restrictions, well-being, motivation, digital use, and online harassment.

The findings show that banning smartphones in class improved academic performance, particularly among lower-performing students and first-year undergraduates. Effects were minimal among higher-performing, postgraduate, and STEM students. Removing phones also reduced disparities in GPA, suggesting that restrictions may help close gaps in learning outcomes. Importantly, attendance rates did not change, indicating that the improvement was likely driven by greater attention and more productive classroom dynamics, rather than students simply attending class more often. Students who experienced classroom phone bans became more supportive of the restrictions and more likely to view them as beneficial, while showing less preference for unrestricted phone use. Classroom observations also found less disruptive behavior and fewer off-topic conversations, along with greater teacher engagement. According to Sungu et al., these findings suggest that students may become more receptive to phone restrictions after experiencing a more focused, phone-free classroom environment.

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