There are roughly 250 million cell phone users in the United States and more than ten times that figure around the globe. Approximately 42 million (or so) people use the “mobile Internet,” in the US, with varying degrees of frequency. The number of people texting constitutes at least 100 million more on top of that. And even though the “mobile Internet” is in its infancy, there’s a high degree of confidence that it will become a lucrative ad medium.

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