Pay-by-phone transactions let you buy digital goods quickly by charging...

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

Pay-by-phone transactions let you buy digital goods quickly by charging purchases directly to your mobile phone. Whether you have a monthly phone bill or prepaid credit, the cost appears on your account, so there’s no need to enter card details