The Call is Coming from Inside the School! How Well Does Cell Phone Data Predict Whether K12 School Buildings Were Open During the Pandemic?

The COVID-19 pandemic forced widespread school closures and a shift to remote learning. A growing body of research has examined the effects of remote learning on student outcomes. But the accuracy of the school modality measures used in these studies is questionable. The most common measures—based on self-reports or district website information—are often inconsistent and lack nationwide coverage. Some studies have used cell phone mobility data to identify school modalities, but there is no consensus yet on how to translate device pings into modality measures. This paper contributes to the literature on modality measurement by examining the relationship between mobile device signals and school modality prior to the pandemic and applies those findings to the pandemic period in Michigan and Washington. We compare our results to state-provided closure data and other nationwide sources, including the Return to Learn Tracker and the COVID-19 School Data Hub. Our findings indicate that cell phone mobility data can accurately predict school modality under normal conditions, but the accuracy drops during the pandemic. These results have implications for future research on educational and health outcomes during both pandemic and non-pandemic-related school closures.