Its the last day of school at Cody High School, and the year felt different for students and teachers with a new cell phone policy.Once students enter the building, theyre in the No Phone Zone, and a sign alerts them that all cell phones must be powered off and put away in backpacks.Watch Cody High School cell phone story here: Cody High School cell phone policy considered a success in first yearWe try to make our rule black and white so it's ea…