Ring Back Tone     iRing is a new concept of idea that can create a new business in the mobile marketing area by utilizing the abandoned resource(Ring Back Tone).     * What is a Ring Back Tone ? It is a mechanical tone that goes ?ring, ring, ring?? when a caller makes a phone call to someone over telephone or mobile phone.    It occurs inevitably until the counterpart answers the call, and therefore has been so far considered an abandoned resource and a process of calling.

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