Mobile Phone Demographics & Text Messaging
Estimated current US wireless subscribers: over 255 million (CTIA, February 2008)
Mobile phone penetration in the US: 18-24 years old: 85%; 25-44 years old: 82%; 45-54 years old: 80%; 55-64 years old: 79% (eMarketer)
SMS is the most popular mobile data application, with 65% of cell phone users sending text messages every day (IDC Group, March 2006)
82% of 18-24 year olds were active users of text messaging (GfK NOP Research). Click on the image below to see the variance in SMS usage by phone user profile.

Studies show that 95% of all SMS get opened (Aaron Watkins, Creative Mobile Marketing, May 5, 2006).
The number of 15 to 19 year olds with cellphones increased from 30% in 2001 to 58% in 2005. (Solutions Research Group).