With an estimated 240 million wireless subscribers in the U.S., mobile is already a $350 billion sector. Of those millions of subscribers, 70 percent now send or receive text messages, 32 million use their phones to go online and 41 percent use their wireless devices to send photos, according to numbers from Nielsen Mobile (formerly Telephia).
And the mobile ad market? eMarketer predicts it will skyrocket by 2011 -- up to $3.6 billion from $123.8 million in 2006.
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