There’s no signal.

New York’s new statewide smartphone ban in schools just went into effect this academic year — city public schools returned Sept. 4 — and students, parents and teachers are already grading the controversial measure.

And they’re giving it an A+.

“The cellphone ban has transformed my class … I haven’t had kids this engaged in years,” a Brooklyn Preparatory High School history teacher, who goes by Mr. Johnson, raved to The Post about the switch.

Governor Kathy Hochul’s new measure requires nearly 1 million kids in K-12 public and charter schools to put all personal internet-enabled devices away from the first bell to the last.

“They’re actively listening to the lessons, answering questions thoughtfully and critically, and best of all, paying attention to and learning

See Full Page