Pay-by-phone lets you make purchases online and charge them directly to your...

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

Pay-by-phone lets you make purchases online and charge them directly to your mobile phone account. Whether you have a monthly phone bill or use prepaid credit, this option simplifies checkout by removing the need for credit cards or bank info