I commented on this elsewhere, but at least one local school recently simultaneously did the following:
1. Required teachers to have kids turn-in their phones for the duration of each class period
2. Banned teachers from kicking kids out of the class who did not turn in their phones.
Teachers don't enforce the rules here because they don't believe the administration will have their back if they try. They can assign detention for students not listening, but many students don't show up for detention, and meanwhile that student still has the phone.
1. Required teachers to have kids turn-in their phones for the duration of each class period
2. Banned teachers from kicking kids out of the class who did not turn in their phones.
Teachers don't enforce the rules here because they don't believe the administration will have their back if they try. They can assign detention for students not listening, but many students don't show up for detention, and meanwhile that student still has the phone.