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Ad Spending On Mobile Devices Projected To Double In Five Years: Page 2 of 2

"This 7 percent coalition of the willing represents a huge market given the fact that there over 200 million cell phones in the United States," Joe Porus, vice president and chief architect for Harris Interactive, said in a statement.

Nevertheless, Porus warned carriers that they need to balance advertising revenue with the potential of irritating subscribers to the point where they jump to a competitor.

Harris based its findings on a nationwide online survey of 1,125 U.S. adults in August.