The typical U.S. mobile subscriber sends and receives more SMS text messages than telephone calls, according to research released Monday by Nielsen Mobile. 
During the second quarter of 2008, a typical U.S. mobile subscriber placed or received 204 phone calls each month.  In comparison, the average mobile customer sent or received 357 text messages per month — a 450% increase over the number of text messages circulated monthly during the same period in 2006.

On Monday, Nielsen Mobile released first quarter 2008 smartphone statistics for the U.S.  Among the findings:
 
Smartphone users are predominantly male (59%) and most are between the ages of 25 and 34 (29%) or 35 and 44 (24.5%). 
A third of smartphone users (35.1%) have an annual household income of more than $100,000. 
More than half (52%) keep their phones for personal use, while another 23% say their company foots the bill.
View the Full Nielsen Media Alert: 6-30-08-smartphone-blast.