Pay-by-phone transactions let you buy digital goods and services quickly using...
https://future-wiki.win/index.php/Can_Carrier_Billing_Help_Users_Who_Do_Not_Want_Banking_Apps%3F
Pay-by-phone transactions let you buy digital goods and services quickly using your mobile device. The cost is added directly to your monthly phone bill or deducted from your prepaid credit, so you don’t need a credit card or separate account