Pay-by-phone lets you buy things online and charge the cost directly to your...

https://wiki-site.win/index.php/What_is_GSMA_and_Why_Does_It_Matter_for_Mobile_Payments%3F

Pay-by-phone lets you buy things online and charge the cost directly to your monthly phone bill or prepaid credit. It’s a simple way to pay without entering card details, making checkout faster and easier on your phone