How Students Actually Use Their Phones During Class: Eye-Tracking Data
Eye-tracking studies in college lectures reveal what students actually do with their phones during class. The findings are more nuanced than the cell-phone-ban debate suggests.
Eye-tracking research in classrooms has matured enough to produce specific findings about how students actually use their phones during class. A 2025 study at three high schools, published in Computers and Education, used unobtrusive eye-tracking devices to measure phone glances during 240 instructional hours. The findings provide concrete data on a behavior that teachers and parents have been debating without precise measurements.
The Glance Frequency
The headline finding was the frequency of phone glances. Students whose phones were accessible during class glanced at them an average of 11 times per hour. The glances were brief (typically 2 to 4 seconds) but added up to roughly 5 to 7 minutes of phone attention per class period. The glances were also clustered, with several occurring in rapid succession when students received notifications.
The Attention Cost
The attention cost of the glances exceeded the time they consumed. Each glance produced a recovery period during which students reoriented to the classroom material. Recovery typically took 15 to 30 seconds, depending on the complexity of the lesson content. The combined cost of glance time plus recovery time often reached 25 to 35 minutes per class period, or roughly half the instructional time.
The Content Pattern
The eye-tracking data also captured what students glanced at. The most common content was social media (45 percent of glances), followed by messaging (28 percent), entertainment (12 percent), school-related content (8 percent), and other (7 percent). The pattern challenges assumptions that classroom phone use is primarily about emergency communication or coordination with parents.
The Variation by Subject
Glance frequency varied by subject. Math and science classes showed the highest glance rates, often around 13 to 15 per hour. English and history classes showed lower rates, often 8 to 10 per hour. The pattern likely reflects both the cognitive demand of different subjects and the engagement levels students brought to different classes.
The Variation by Phone Position
The strongest predictor of glance frequency was phone position. Students with phones on desks glanced an average of 14 times per hour. Students with phones in pockets glanced 7 times per hour. Students with phones in backpacks glanced 3 times per hour. Students with phones collected at the classroom door glanced once or twice per hour, presumably during bathroom breaks.
The pattern suggests that physical distance from the phone substantially affects classroom behavior, even when phones are technically accessible.
The Self-Perception Gap
One of the more striking findings was the gap between actual and reported phone use. Students surveyed before the eye-tracking estimated they checked their phones two to four times per hour during class. The actual rate was three to five times higher. The students were not lying; they substantially underestimated their own behavior because each individual glance was brief enough to feel like a minimal interruption.
“The phones interrupted them more often than they realized,” said Dr. Constantin Vasiliu, who led the study. “Each individual glance felt small. The cumulative effect of dozens of small glances was substantial.”
The Implication for Bans
The research has implications for the ongoing policy debate about phone bans in schools. The data suggests that policies allowing phones in pockets but restricting use produce minimal behavior change. The pockets are accessible enough that glance frequency remains high. Policies requiring physical separation (phones in lockers, backpacks across the room, collection by teachers) produce substantially larger behavior changes.
What Teachers Can Do Without Bans
For teachers in environments without formal bans, the research suggests several practical approaches. Asking students to place phones face-down in a specific corner of their desk reduces glance frequency moderately. Asking students to place phones in backpacks reduces it substantially. Asking students to leave phones in a basket at the door reduces it almost entirely.
The intervention does not need to be a school policy to be effective. Individual teachers who request specific phone positions consistently can produce measurable changes in their own classrooms.
What Students Should Know
For students, the practical implication is the gap between perceived and actual phone use. Many students believe their phone checking is minimal because each individual instance feels brief. The accumulated effect is substantial enough to consume large portions of class time. Students who want to maintain academic focus often benefit from physical separation from their phones, even when they believe they can resist the impulse to check.
The behavioral change is uncomfortable initially. Students who try keeping phones in backpacks for a week typically report adjustment difficulty followed by reduced anxiety about phone access. The students who maintain the practice often report improved classroom engagement and lower overall phone use across their lives.
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