au Flat Calling 24

[Termination of the “free up to 2 month” benefit]
As of May 31, 2017, applications for this benefit are no longer accepted.

This service offers free domestic calls to au mobile phones at a monthly flat rate of ¥477 for 24 hours!

Flat rate ¥477/month Application Required


Photo: Domestic calls to all au smartphones/au mobile phones are free 24 hours a day!

This service offers free domestic calls to au mobile phones at a monthly flat rate of ¥477 for 24 hours!
Recommended for users who often make calls to au smartphones and au mobile phones at night.
You can call as many au users as you like.

  • * This discount service is exclusively for "LTE plan".

Eligible models

  • 4G LTE Smartphones
  • iPhone (excluding iPhone 4S)

Applicable period

You can choose from two options for application, "this month" and "next month". *1
If you choose "this month", the change will be applied from the day of the application.



  • *1You can choose the timing of the change from two options, "this month" and "next month". Changes within a month from the third time onward will incur a fee of ¥1,000 per change. Depending on the timing of your application, the service may be applied from the following day, or month after the next month if you choose "next month".
  • Calls to special numbers including the Answering Service (1417, 09044441417 (remote operation)) are not counted as 24-hour free domestic calls to au mobile phone users.
  • This discount is not applicable to au World Service calling and data communication charges when used outside of Japan, and calling charges through use of a CDMA Prepaid Card.
  • If you sign up for the service, or cancel the contract partway through the month, the flat rate is calculated on a prorated basis.
  • This discount cannot be combined with "Call Designation Flat Rate".
  • When "LTE Plan" subscribers make an application to change (add or cancel) "Wide Calling 24" and "au Flat Calling 24", it is regarded as a change of a rate plan.
  • If KDDI determines that a call may have a negative impact on communications for other users, such as a call that lasts for a long period of time, KDDI reserves the right to disconnect that call.
  • The names of rate plans and data flat rate services for 4G LTE (au VoLTE) Android™ smartphones have "(V)".
  • By phoneOpen 9:00 – 20:00

    • English

      0120-959-472(Toll Free)

    • Portuguese

      0120-959-473(Toll Free)

    • Chinese

      0120-959-476(Toll Free)

    • Korean

      0120-959-478(Toll Free)

    • Tagalog

      0120-933-952(Toll Free)

    • Vietnamese

      0120-933-961(Toll Free)

    • Japanese
      about au mobile services

      157(Toll Free)from au phones

      0077-7-111(Toll Free)

      about Internet services
      Contract / Fee / Billing

      0077-7084(Toll Free)

      Connection setting / failure

      0077-777(Toll Free)