Pay-by-phone lets you buy online using your mobile number. Charges appear on...

https://zulu-wiki.win/index.php/What_Are_the_Downsides_of_Carrier_Billing%3F

Pay-by-phone lets you buy online using your mobile number. Charges appear on your monthly phone bill or come off your prepaid credit. It’s a simple way to pay without cards or accounts, making checkout quicker and easier on your phone.