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

https://rileysexcellentnews.readspirex.com/posts/is-pay-by-phone-billing-the-same-as-a-mobile-wallet

Carrier billing lets you buy apps, games, or digital content and charge the cost directly to your monthly phone bill or have it taken out of your pay-as-you-go credit. It’s a simple way to pay without needing a credit card or bank account