Both the scenarios below show school with phones in the classroom:
The second picture demonstrates mobile phones being an active distraction in the classroom, with the user listening to Spotify instead of the teacher. In both cases, the teacher and the classroom expectations are the influencing elements - not the phones themselves. Just becuase students have a phone, doesn’t mean they will automatically do the wrong thing. The first teacher allows the use of phones for educational purposes and students know what they can and cannot do. In the second classroom poor choices with mobiles phones seem to be an issue and yet this may be solved with some strong rules and consequences. If it leads to a total classroom ban - so be it. But I believe it is good to give students the chance to learn to self-moderate and be responsible instead of tying their hands behind their backs.
Crompton, H., Burke, D., & Gregory, K. H. (2017). The use of mobile learning in PK-12 education: A systematic review. Computers & Education, 110, 51-63.
Ganito, C. (2011) "Transparent classrooms: How the mobile phone is changing educational settings." International Journal of Cyber Ethics in Education (IJCEE) 1 (3) 59-69.