Those new cell phone caddies may be more useful than expected. It seems that cell phones have so conditioned our students that the phones are a distraction even when they are in pockets or backpacks.
Putting the phones out of reach helps students concentrate on other things. It is not a perfect solution, but it is better than leaving the phones within reach. This is typical habitual and/or addictive behavior. Students crave their phones even when they cannot have them.
Watch this video to see the hard evidence.
https://www.edutopia.org/video/theres-cell-phone-your-students-head