The K-Premium service

What is the K-Premium Service?

K-Premium is an optional service tailored for JP's mobile operator subscribers. Due to the restrictions on the operators and frequent MNPs, some JP subscribers cannot receive messages from alphanumeric sender IDs or some messages can get blocked. As the messages sent via K-Premium will be directly passed to the JP operators, better delivery rates are expected. Sender IDs for messages through K-Premium will be set as below.

You will need to be registered in order to use K-Premium, and your registration details will be shared with KDDI Corporation. To prevent abuse of the service your registration details might also be shared with Softbank Group Corp and NTT Docomo, Inc. as the need arises.

Please contact for more details and registration.

Details of K-Premium Sending

How to set K-Premium

Please add K-Premium optional parameters when you make your request to send to a JP number. The messages will be sent using our K-Preimum direct route and you will be charged the K-Premium price per message sent.


Please set the sender ID that you specify at the registration with the option parameter jp_kddi_sender and it will be shown as you specify at the device of the recipients.

SoftBank recipients

Sender ID that will be shown at the recipients will be fixed to 22472.

DOCOMO recipients

Sender ID that will be shown at the recipients will fixed to 0344057440.

Cost for K-Premium

The cost of K-premium service delivery can be referred in the price page.

For more details, please see our documentation.