Across the country, kids are returning to school today. In the Dallas area, several cities now have laws that prohibit the use of handheld cell phones in school zones, so parents and other drivers need to be alert. Here is a list of Dallas-area towns and cities with this law: Dallas, Duncanville, Flower Mound, Highland Park, Highland Village, Irving, Sachse, University Park, and Wylie. Be careful out there.