 The latest state to ban cell phones in schools, Virginia. Last month, U.S. Surgeon General Vivek Murthy called for warning-style labels on social media, like how you'd see on tobacco products. This is a warning that has already been resonating with lawmakers and parents. L.A.'s school district, which is the second biggest in the country, just passed a ban on cell phones in schools. Ohio, Florida, and Indiana have passed similar laws, with more in the works in other states. ABC's Elizabeth Schulze. Wall Street, the Dow was up 429 points today.