RESEARCH BRIEF -- Apr 2 -- According to a new Nielsen Mobile report, 23% (58m) of all U.S. mobile subscribers have been
exposed to advertising on their phones in the past 30 days. Half (51%
or 28 million) of them responded to a mobile ad. The number of data users who recalled seeing mobile
advertising between the second and fourth quarters of 2007 increased
38% (from 42 to 58m subscribers). FULL ARTICLE @ CENTER FOR MEDIA RESEARCH