I learned early on with cell phones, that when you ask a student to hand you their phone, it very often becomes confrontational. A cell phone is a very personal item for some people.
To avoid the confrontation I created a “distraction box” and lumped cell phones in with the many other distraction that students bring to class. These items have changed over time, but include “fast food” toys, bouncy balls, Rubics cubes, bobble heads, magic cards, and the hot item now are the fidget cubes and fidget spinners.
A distraction could be a distraction to the individual student, the other students or even a distraction to me. On the first day of the year I explain to my students that if I make eye contact with them and point to the distraction box, they have a choice to make. If they smile and put the item in the box, they can take the item out of the box on the way out of the room. If they throw a fit and put the distraction in the box, they can have it back at the end of the day. If they refuse to put the distraction in the box, they go to the office with the distraction.
On the first day of the year we even practice smiling while we put an item in the box. The interaction is always kept very light and the students really are cooperative. It has been a few years since an interaction actually became confrontational, because I am not asking them to put the item in my hand. I even have students sometimes put their cell phone in the box on the way in the door because they know they are going to have trouble staying focused.
This distraction box concept really has changed the atmosphere of my room. Students understand what a distraction is and why we need to limit distractions. We even joke sometimes because the box isn’t big enough to put “Billie” in the box.