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

https://www.bright-bookmarks.win/carrier-billing-lets-you-buy-apps-games-or-services-and-have-the-cost-added

Carrier billing lets you buy apps, games, or digital content and charge the cost directly to your phone bill. If you have a monthly plan, the purchase adds to your next bill. For pay-as-you-go users, the amount deducts from your available credit