I was just reading this fabulous blog post that I first spotted in Vinod Khosla's Twitter stream.
Matthew Devost: 23 Devices My iPhone Has Replaced
Nielsen Wire: U.S. Teen Mobile Report: Calling Yesterday, Texting Today, Using Apps Tomorrow: No one texts more than teens (age 13-17), especially teen females, who send and receive an average of 4,050 texts per month. ..... Texting is currently the centerpiece of mobile teen behavior. 43 percent claim it is their primary reason for getting a cellphone, which explains why QWERTY input is the first thing they look for choosing their devices. ..... All of this texting activity has come at the expense of voice. .... popular apps such as Facebook, Pandora or YouTube.