comScore says that the United States has caught up with Western Europe in the adoption of 3G with 28.4 percent of American mobile subscribers having 3G devices versus 28.3% in the largest countries in Europe. That works out to about 64.2 million devices - up 80% from last year. When it comes to 3G penetration are Italy and Spain lead U.S. The growth in 3G penetration comes at a time when the data revenues are growing at a rapid clip for the mobile carriers.