Business Insider: Carrier Billing: Why It's Becoming An Increasingly Popular Way To Pay On Phones Worldwide

Carrier billing allows mobile users to buy digital goods like ring tones, music, apps, e-books, and in-app purchases by adding the cost of the purchase directly to their mobile bills. While carrier billing is very simple and seamless from the consumer's perspective, it depends on a complex set of relationships between wireless carriers, app stores, platform vendors, and app developers. Those relationships also vary substantially country by country, depending on each market's mobile ecosystem.

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