Thank you for using Xoxzo, Cloud Telephony Platform.

We are excited to announce that our K-Premium service will be upgraded on 5th Dec 2017.


Originally, the current 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 upgrade to be released for K-Premium service will allow direct connections to all Japanese operators, and not only limited to KDDI.

The major points of this upgrade are:

  • 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.

Please also note:

  • The parameter to use K-Premium will not be changed. Please continues using the K-Premium flag jp_kp and set your sender id with jp_kddi_sender. jp_kddi_sender will still be used when sending to KDDI.

We expect increased delivery rates to Japanese numbers with this upgrade.

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.