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

https://www.apu-bookmarks.win/carrier-billing-lets-you-buy-apps-games-or-services-and-charge-the-cost-1

Carrier billing lets you buy apps, games, or digital content and charge the cost directly to your phone account. Whether you have a monthly plan or use pay-as-you-go credit, the purchase appears on your phone bill or reduces your prepaid balance