The mobile subscriber selects the content or service he/she wants, and is billed only for the product requested. The content is often presented in print with separate order codes for each download, or through a browse-and-buy WAP site on the phone. There is no further billing of the mobile subscriber until more content is requested.
AKA:
Polyphonic Ringtone Poly 4, 16 & 24. (refering to the number of instruments used to create the poly ringtone); Polytone
