Direct Carrier Billing

I am little confused when it comes to the term 'Direct Carrier Billing'. I
though Direct Carrier Billing only implemented by telecom companies such as
At&t, Verizon wireless, T-mobile. However, there exist third-party direct
carrier billers such as BilltoMobie, Boku, OpenMarket, Payfone, Zong. What
does they do?

Received on Wednesday, 7 May 2014 11:45:22 UTC