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au Flat Calling 24

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", "LTE plan(V)".

Eligible models

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

Applicable period

You can choose from two options for application, "this month" and "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".
  • You can choose the timing of the change from two options, "this month" and "next month". If you choose "this month", the change will be applied from the day of the application. 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".
  • When "LTE Plan", "LTE Plan(V)" 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.

*All of the indicated amounts exclude tax unless otherwise specified.