NYTimes: According to the CTIA, the number of text messages sent grew by 50 percent last year. At the same time, voice minutes have dropped and the average length of a call has slipped from 2.27 minutes in 2008 to 1.81 minutes in 2009.
Various industry sources note that people now use their phones more for data transmission than for talking. Originally, talking was the only cellphone application, said Dan Hesse, chief executive of Sprint Nextel. But now its less than half of the traffic on mobile networks.