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Ringbacks Could Feature Ads

Ringbacks that play alternative audio instead of the standard ring to callers while they are dialing a number are starting to cause a commotion with U.S. mobile users.The number of U.S. ringback subscribers tripled last year, according to M:Metrics. A recent J.D. Power and Associates study also found that 9 percent of U.S. mobile consumers used ringbacks. IDC estimates that 40 million global users will subscribe to ringback tones by 2010.