I did after September 11, 2001. That was the only day so far we couldn't make a call, kept getting a fast busy. I called my wife from my office phone before I left to pick her up and told her to walk east on a specific street and I would circle around the building where she worked and drive alonside that sidewalk until I found her in the mess. It was espically bad for us because she worked in a tall building for a law firm which quietly called all their lawyers and told them to evacuate but didn't allow staff to leave until the lawyers were all safely out of the building.