Pay-by-phone transactions let you buy digital goods and services quickly using...

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

Pay-by-phone transactions let you buy digital goods and services quickly using your mobile device. Charges go straight to your monthly phone bill or are deducted from your prepaid credit, so there’s no need to enter card details