Advertising on Ring Back Signal

A company called Promotel is trying to patent replacing the ring-back signal (the stuff you hear when you dial someone before they pick up) with advertising messages. Acording to a consultancy Ovum, "the worldwide market for "ring backs" is projected to grow from $148 million in 2003 to $2.4 billion by 2008."
-- via Moco News

Earlier:
Ringtone Advertising - Check
Advertising on Ringtones
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