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

https://www.thecoastlandtimes.com/sponsored-content/pay-by-phone-how-carrier-billing-quietly-became-an-everyday-payment-method-4a6c068e/

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