Here´s something I can believe. I´m all for BYOD programmes and such, and I love integrating technology into learning. My students do a lot of research, and their phones, tablets and laptops can be powerful tools. But I´d regulate it. Collect their phones in in the morning, give them back at the end of the day, and if they´re needed in the mean-time, then they can be used at the teacher´s discretion.