At this school, all students are required to put their cell phones in a bag and seal it before entering class.

They can remove the seal when they leave.

https://t.co/8OgnCbAbEh https://video.twimg.com/ext_tw_video/1830515174358274049/pu/vid/avc1/720x1280/lVIh3_xM4gRQ1xMo.mp4?tag=12