There are so many ways in which students use their cellphones for unfortunate or unreasonable circumstances. Today, however, students used it to look at data closer up and analyze it by making scatter plots, lines of best fit, equations, etc. As part of our data unit they are getting used to interpreting the world around them. This use of cell phones is and will forever be completely valid.
I am a math teacher in the New York Department of Education. I infuse technology and real-world problems into my curriculum in order to prepare my students for the future. I would love for people across the country to recognize we teachers can't do it alone. If you don't believe me, come visit my classroom!