DCB = Direct Career Billing

“Direct carrier billing (DCB) is an online mobile payment method which allows users to make purchases by charging payments to their mobile phone carrier bill.^[1] The global direct carrier billing market was valued at US$ 29.8 billion in 2019.^[2] In July 2020, Juniper Research estimated that in 2019 end users around the world spent approximately US$ 33 billion via carrier billing.^[3]

The method is useful in developing countries and undeveloped areas where credit card usage is not widespread. In India, only two percent of the population have a credit card whereas mobile phones are widespread” – Read the full article in Wikipedia https://en.wikipedia.org/wiki/Direct_carrier_billing