Carrier billing lets you buy apps, games, or media by adding the cost to your...

https://www.bookmark-tango.win/carrier-billing-lets-you-buy-apps-games-or-subscriptions-and-charge-them

Carrier billing lets you buy apps, games, or media by adding the cost to your phone bill or deducting it from your pay-as-you-go balance. It’s a simple way to pay without needing a credit card or separate account