Carrier billing is a simple way to pay for digital purchases by adding the cost...

https://www.bookmarkmaster.win/carrier-billing-lets-you-buy-apps-games-or-digital-content-and-charge-the

Carrier billing is a simple way to pay for digital purchases by adding the cost to your monthly phone bill or subtracting it from your prepaid credit. It lets you buy apps, games, or subscriptions without entering card details