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

https://www.novabookmarks.win/carrier-billing-lets-you-buy-digital-products-or-services-and-pay-using-your

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