The Voicemail | NPR

Voicemails are deeply embedded into memories of 9/11. On that day in 2001, as people all across New York City tried to get hold of their friends and family, cellphone networks were overloaded. And for some of the victims inside the planes and towers, leaving a voicemail was their last way of communicating with their loved ones. In the weeks leading up to the 20th anniversary of the Sept. 11 attacks, NPR set up an old phone booth in Brooklyn Bridge Park — across the river from the new World Trade Center — and invited people to leave a voicemail for someone they lost that day.