Thirty states now limit or ban cellphone use in classrooms, and teachers are noticing children paying attention to their lessons again. But it’s not clear whether this policy — unpopular with students and a headache for teachers to enforce — makes an academic difference.  If student achievement goes up after a cellphone ban, it’s tough […] The post Cellphone bans can help kids learn — but Black students are suspended more as schools make the shift appeared first on The Hechinger Report.