I couldn't find a detailed description how the payment system works from the user perspective. I got impression that in some cases, it's added to a phone bill and handled by an operator (great experience), and in some cases it would be a credit card based payment (not that great).

I can't believe that the operator based system could work with all the operators in the beginning, thus is there any details which operators are partnering? It's crucial information to understand the initial market size so that we can plan launch schedules.

Also, how exactly will the credit card based payment system work?