Pay-by-phone lets you buy digital goods and services with just your mobile...

https://legacystance.com/frictionless-payments-the-rise-of-pay-by-phone-transactions-in-digital-commerce/

Pay-by-phone lets you buy digital goods and services with just your mobile device. Charges go straight to your monthly phone bill or use prepaid credit if you have it. It’s a simple way to pay without needing a credit card or bank details during checkout.