A year without phones in class: test scores barely moved, and something else did

A study covering 214 schools that introduced full-day phone storage has produced a result that satisfies almost nobody: on the measure most often cited to justify the policy, nothing happened.

Standardized test results in the schools that adopted storage were statistically indistinguishable from matched comparison schools after one full year. The point estimate was slightly positive and well inside the noise.

What did change

Disciplinary referrals fell 21 percent. Within that, incidents involving a recorded video — fights filmed and circulated, recordings of staff, images shared without consent — fell 63 percent, which the authors describe as the largest single effect in the study.

Survey measures moved too. Reported loneliness declined in every grade, and the change was concentrated at lunch and between periods rather than during class. Observers logged more conversation and more noise in cafeterias, which several principals initially recorded as a behavior problem before recognizing what it was.

The cafeteria got loud again. It took us a month to realize that was the point.— A high school principal at one of the schools studied

How it was implemented

Implementation varied and the variation mattered. Schools using lockable pouches collected at the door reported near-total compliance. Schools relying on a rule that phones stay in backpacks reported compliance the authors called “nominal,” and those schools showed none of the measured effects.

• Schools studied: 214, over one full academic year
• Test results: no statistically significant change versus matched comparisons
• Discipline: referrals −21%; incidents involving recorded video −63%
• Implementation: effects appeared only where devices were physically secured

The authors are direct about the limitation. One year is short for academic outcomes, particularly for students who had already spent years with a phone in class, and effects on learning could appear in a cohort that goes through the policy from the start. What the study can say is that the case for these policies rests on behavior and wellbeing, and that arguments for them based on test scores are not supported by this evidence.