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

https://travistrcm708.theburnward.com/is-carrier-billing-good-for-people-without-a-credit-card

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