Thank you for using Xoxzo, Cloud Telephony Platform.

We are excited to announce that our K-Premium service has move choices that you can select from.


Our very first K-Premium service was released in 2013, as an optional feature for our sister SMS API service SMS Delivery Service, EZSMS.

Although requiring registration and an approval before use, K-Premium has been a popular optional service because it allows you to set the sender id and uses a direct route for KDDI recipients.

The upgraded K-Premium service that allows direct connections to all Japanese operators and not only limited to KDDI was released as Kpremium Version 2 in 2017 winter, and that includes,

  • Sendings to ALL Japanese operators are to be direct, not just to KDDI
  • Sendings to Docomo/Softbank using K-Premium will set a fixed SenderID despite the set sender with jp_kddi_sender
  • 13 credits will be deducted for an each K-Premium SMS sent.

Now we have more freedom on Xoxzo to user K-premium service.

For all those wish to use K-premium service only to the KDDI numbers, here we released Kpremium Lite that looks up the carrier of the number and send to only KDDI recipients as K-premium sending.

We hope you well-utilize these options to suit your needs.

Please feel free to contact us at ( to inquire any further information or assistance concerning this upgrade.

Aiko Yokoyama

Aiko Yokoyama

Customer Success and Operations

Joined January 2014. Experienced as a clerk in Foreign Trading company, started and maintained an online supplement store. Lived in overseas for 15 years. Looking forward to communicating our customers with the broad view based on those experience.