More than half of all mobile subscribers in the U.S. own a smartphone

. New numbers released this week by Nielsen reveal that 55.5% of mobile subscribers in the U.S. now own a smartphone as of July 2012, an increase from 41% in the same period last year. The research firm found that adults between the ages of 25 and 34 were the largest group of owners with 74% penetration, while 58% of young adults between 13 and 17 years old owned smartphones, an increase from only 36% in July 2011.

"Among most age groups smartphones represent the majority of U.S. mobile subscribers, but American teens were the age group adopting smartphones the fastest," Nichole Henderson, a Nielsen analyst, said.

Boy Genius Report , More than half of all mobile subscribers in the U.S. own a smartphone, More than half of all mobile subscribers in the U.S. own a smartphone