Visualization of what AT&T's network looked like on 9/11/01

CNN has a slideshow of graphs that show what AT&T network traffic looked on the days on which events initiated a  high volume of calls and texts. Included are visualizations of network traffic on 9/11/01 as well as the days on which the East Coast Earthquake and  Hurricane Katrina occurred.

See the article on the CNN site:

http://money.cnn.com/gallery/technology/mobile/2012/10/09/mobile-network-traffic/index.html