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

https://www.bookmarkingvictor.win/carrier-billing-lets-you-buy-apps-games-or-subscriptions-and-pay-for-them

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 appears on your next bill. For pay-as-you-go users, the amount is deducted from your available credit