The number of voice calls being made has remained steady over the past two years, but text messages sent and received have increased by a staggering 450 percent. At the end of 2007, text messaging had just overtaken voice calls 218 to 213. But by the end of the second quarter of this year, an average mobile phone subscriber placed or received 204 calls, compared with sending or receiving 357 text messages. Teens between the ages of 13 and 17 now send or receive 1,742 messages per month, compared to the second-highest age group, 18 to 24 year olds, who send and receive about 790 messages. Read the story in Wired News or New York Times.