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In Korea, the number of VoIP users is expected to rapidly increase after introducing VoIP number portability on October 31, 2008. The total number already gone beyond 2 million, and the number of customer churn has exceeded 0.35 million. Considering the high penetration rate of broadband Internet in households is exceeding 80 percent, it can be said that Korea is an environment which could provide a good quality of VoIP. Therefore, for the success of VoIP, it is critical to work out effective market strategies and design a service reflecting consumers' preferences.
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