Carrier billing lets you buy apps, games, or services and pay through your...

https://www.bookmarkingtraffic.win/carrier-billing-lets-you-buy-things-like-apps-or-music-by-charging-the-cost

Carrier billing lets you buy apps, games, or services and pay through your phone bill. Instead of using a credit card, the cost is added to your monthly phone invoice or taken from your prepaid balance