Errata

http://nytimes.com/2005/01/09/technology/09message.html

Many high school and college students accustomed to sending unlimited instant messages on their computers do not adapt easily to text messaging's pay-per-message format, and end up with unexpectedly high bills when they get involved in keypad conversations that involve hundreds, even thousands, of messages a month. The results are angry confrontations with parents, long-term payment plans and the loss of cellphone privileges.

...

Teenagers are clearly driving the trend. "Younger people do text messaging a lot more than older folks," said Mr. Nogee of Instat. "They're more used to it from instant messaging on the computer, from growing up with it. Older people would rather call up and talk."

According to a recent survey by the Pew Internet and American Life Project, 38 percent of all teenagers who use the Internet have sent a text message using a cellphone. "Text messaging is a way to take instant messaging on the road," said Amanda Lenhart, a Pew research specialist. "It's definitely growing."