Nearly a quarter of all cell phone users in the U.S. say they've seen an advertisement on their phones in the past 30 days, according to a report from Nielsen Mobile, which tracks these trends.
About half of those who saw advertising on their mobile phones in the past month responded to an ad, the report said. In the fourth quarter, there was a big jump in the number or people reporting that they had spotted advertisements on their mobile phones. In fact, this figure rose 38 percent to 58 million users who said they saw advertising on their cell phone, compared with only 42 million who said they saw advertising on their phones in the second quarter of 2007. Nielsen surveyed 22,000 active mobile data users in its fourth-quarter survey.