121 million smartphones sold last year in America, the iPhone accounted for 45 percent, making Apple the largest smartphone maker in the U.S. Overall smartphone sales were up 21 percent year over year.
…iPhone sales grew 64 percent among lower income customers who earn under $30,000 last year.
…Most of the mobile industry’s growth seen in the U.S. in 2013 came from prepaid devices, which grew 68 percent last year, NPD said. Prepaid devices also accounted for 29 percent of the smartphone market, up from 14 percent in 2011.