Some teachers are all for allowing students to have their phones in school. They use them as learning devices and manage the possible distractions that come with having your phone on in class.
On the other hand some schools have a strict no phones in school policy, confiscating any phone that sees the light of day.
Regardless of which camp you are in I am sure that every teacher has wanted to do what this teacher does in this video. Click the link to watch the video (length 45 seconds)
I also came across this funny cartoon that aptly describes some student’s attitudes to having their phones in school