If everyone in the school is trying to call someone it might be too loud to hear anyone. It also may overload phone systems. The 911 operators would not be able to answer anyone because there would just be calls that keep coming in. I know this because in the article Should Cell Phones Be Allowed in Schools?Source #2 paragraph 4 the author says,”Cell phones may not even be very useful in a school emergency, according to Kenneth Trump, president of National School Safety and Security Services. He told WR News that too many cell phone calls in an emergency would “overload phone systems and 911