Carrier billing lets you buy apps, games, or subscriptions and charge the...

https://www.bookmark-fuel.win/carrier-billing-lets-you-buy-apps-games-or-other-digital-items-and-charge-the-1

Carrier billing lets you buy apps, games, or subscriptions and charge the payment directly to your phone bill. If you have a monthly plan, the cost appears on your next bill. For pay-as-you-go users, the amount is taken from your available phone credit