Article: Ringback tones start to resonate; initial response to the tones has been impressive, but carriers are still fine-tuning their business strategies.(Content & Apps)

Ringback tones--those songs incoming callers hear when they dial a mobile phone number--have been lauded for their popularity with Asian and European consumers. In South Korea, for example, SK Telecom's ColoRing service achieved 30-percent penetration with its ringback tones in its first year of launch, according to Ovum Research.

In the United States, ringback tones are a relatively new phenomenon. Only a handful of operators offer the service. However, initial response from U.S. consumers has been impressive, with operators reporting subscriber take rates that surpass expectations. In fact, T-Mobile USA's nationwide CallerTune service has sold more than 1 ...

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