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

https://www.alphabookmarks.win/carrier-billing-lets-you-buy-digital-goods-or-services-and-charge-the-cost

Carrier billing lets you buy apps, games, or digital content and have the cost added directly to your monthly phone bill or subtracted from your prepaid balance. It’s a simple way to pay without needing a credit card or separate account