The total amount of money spent by U.S. marketers on mobile advertising and promotions will reach about $56.5 billion by 2015, according to Mobitrove. That expected figure is more than six times the almost $9.3 billion U.S. marketers spent on mobile advertising and promotions in 2010.
Mobitrove divides mobile marketing into advertising and promotions (special offers). In 2010, U.S. marketers spent about 2.1 times as much on mobile advertising (almost $6.3 billion) as they did on mobile promotions (about $3 billion).
http://www.marketingcharts.com/direct/mobile-marketing-spend-to-sextuple-2010-2015-17282/