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

https://www.primary-bookmarks.win/carrier-billing-lets-you-pay-for-apps-games-or-digital-content-by-adding-the-1

Carrier billing lets you buy apps, games, or digital content and charge the cost directly to your phone account. If you have a monthly plan, the purchase appears on your phone bill. With pay-as-you-go, the amount is taken from your available credit