A first broad national study finds that restricting student cellphone use via Yondr pouches produces close to zero overall academic gains in the short term, while suspensions increase in the first year. Researchers comparing roughly 4,600 schools across the U.S. used test scores, surveys, and discipline data to assess the impact. The study found a temporary shift in behavior, including an average 16% rise in suspensions during the first year as schools implemented pouch policies, with disciplinary levels returning to typical levels in later analysis. Researchers also found little evidence of improvements in absenteeism or perceptions of online bullying. The results present a policy constraint for states and districts pushing or already mandating bans: lawmakers may need to revisit implementation design and weigh compliance disruption against the lack of measurable test-score impact.