Earlier this year, the company launched direct carrier billing (DCB) for Amazon shoppers, but now Prime members can pay for their subscriptions using the service as well.
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"An amazing range of goods and services can now be purchased through the phone bill in Japan," said chief executive Ray Anderson.
"The Bango platform ensures global retailers can offer these customers the trust and transparency they want from a payment method, and can deliver this at scale.”
Direct carrier billing makes it easier to complete online purchases as customers don’t have to fill in their card details each time. Instead they select the DCB option and the cost is added to the next phone bill.
The extended service is available to KDDI and NTT DOCOMO customers, which account for around three-quarters of all mobile subscribers in Japan.