Some very important context that the researchers don't mention: during the same period that they are claiming test scores improved because of phone bans, Florida changed the way they administer standardised tests. Starting in 2024, they switched from doing one end-of-year assessment and started administering more frequent tests throughout the year in order to better gauge a student's progress and provide a tighter feedback loop. (source: https://www.educationadvanced.com/blog/florida-standardized-...)

It's much more likely that simply changing the way they administer these tests had a more significant impact on test scores than phone bans.