Pay-by-phone lets you buy online and charge it directly to your phone bill or...

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

Pay-by-phone lets you buy online and charge it directly to your phone bill or prepaid credit. It’s a simple way to pay without needing a credit card, making checkout faster and easier—especially on mobile devices