Colorado state law required all school districts to put a cell phone policy on the books by July 1. Many major districts are opting to ban cell phones and smart watches for the entire duration of the school day, especially for K-8 students. Dialed in: Colorado school districts face first year of required phone policiesThey gave me this thing called a Yondr pouch, and I had to put my phone away, he recalled. Cherry Creek School District: Cell phone policies are left up to the principal of each individual school. Douglas County School District: Elementary and middle school students must keep phones silenced and out of sight for the entirety of the school day.