Nielsen Reports that 50% of U.S. Mobile Phone Owners Have Smartphones

	50% Of U.S. Mobile Phone Owners Now Have Smartphones  Here's a big shift happening right before our eyes: Smartphones now account for 50% of all mobile phones in the United States, Nielsen reports.  Don't expect smartphone growth to slow any time soon. In the last three months, 66% of all mobile phones sold were smartphones.  Read more »