Unlimited Calling Plan S(Mobile phone)

This rate plan is intended for 4G LTE Featurephone (au VoLTE). Unlimited domestic calls 24 hours a day (up to 5 minutes) [1]. This service is available in combination with Two-step data flat Z(Mobile phone) and other Flat-rate Data services.


Basic Charge

Monthly Basic Charge When 2-year contract [2] is applied ¥1,200
Begore discount services are applied ¥2,700
Domestic calling charge To au mobile phones Calls up to 5 minutes: Free
Calls that exceed 5 minutes: ¥20/30 seconds
Calls made between family members that exceed 5 minutes are also free [3]
To other carriers' mobile phones or landline
Data communications charge communications flat-rate service Two-step data flat Z(Mobile phone), Flat-rate Data 1(Mobile phone)/3(Mobile phone)/5(Mobile phone)
Domestic SMS charge To au mobile phones Sending: ¥3/time [4]
Receiving: Free
To other carriers' mobile phones and PHS
  • *When you subscribe to this plan, any currently applied discounts may be terminated. See below for details.

Applicability of discounts and campaigns (in Japanese only)

  • [1]Certain calls are not eligible for this service.
  • [2]2-year contract is automatically renewed in two-year units. In the case of contract termination, a contract cancellation fee of ¥9,500 is incurred (excluding the renewal period).
    The following discount services also apply.
    -Monthly basic charge when 2-year contract (No automatic renewal) is applied... ¥1,500/month
    • * The month following the month of application is counted as the first month, and a contract cancellation fee (¥9,500) is incurred if the contract is cancelled within 2 years.
    -Monthly basic charge when Smile-heart Discount is applied... ¥1,000/month
  • [3]When 2-year contract (Smile-heart Discount or 2-year contract (No automatic renewal) ) + Family Discount are applied, calls made to family members who are subscribed to the same Family Discount are free.
  • [4]Sending SMS (C-mail) to family members within Japan is free when Family Discount is applied.
Application Required

Flat-rate Data services that can be combined with this service

Two-step data flat Z(Mobile phone)

Monthly flat rate Data communications charges for the data that exceeds 500KB. Monthly maximum charge
Two-step data flat Z(Mobile phone) ¥0~ [6] ¥0.03/KB ¥4,200
  • [6]The flat rate includes free communication allowance that is equivalent to 500KB.
    • * The Internet may be accessed in some applications even when a user does not operate the device, possibly exceeding the amount of free communication allowance(500KB).
    • * au Smart Value and au Smart Value mine are not available.
    • * Data Charge, Data Gift, Data Carryover, Long Term Hospitality Data Gift, au STAR Loyal, and au Wi-Fi SPOT are not available. Extra Option is available.

Flat-rate Data 1(Mobile phone)/3(Mobile phone)/5(Mobile phone)

Data quantity Monthly charge Availability of Data Carryover
Flat-rate Data 1(Mobile phone)(1GB) ¥2,900 -
Flat-rate Data 3(Mobile phone)(3GB) ¥4,200 -
Flat-rate Data 5(Mobile phone)(5GB) ¥5,000
  • * Flat-rate Data 2(Mobile phone) cannot be chosen.

The unused data amount can be carried over to the next month.

*For Flat-rate Data 5(Mobile phone), the unused data amount in a month can be carried over and used by the end of the next month.All of the unused data amount can be carried over, eliminating waste.

Data Carryover

You can purchase data quantity starting from 0.5GB using the Data Charge service when needed.

You can purchase as much data quantity as you need (in 0.5GB or 1GB units) in real time when you need it. You do not need to worry even if you use a lot of data.

Data Charge

Data Present allows you to give purchased data to friends and family.

Give newly purchased data to friends and family. The person who receives the Data Present can increase the data amount they use by the amount given.

Data Present

Data Gift allows family members to give data quantities to each other without waste.

The Data Gift service allows family members to give the monthly data quantities (in 0.5GB units) to each other in real time at no additional charge, ensuring that extra data quantities are used without going to waste.

Data Gift

Long Term Hospitality Data Gift gives long-term customers extra data amounts.

Long-term au customers will receive an extra data amount once every 3 months according to the au contract period (5 years and over) and subscribed Flat-rate Data service.

* For Flat-rate Data 1 users, this service is only eligible for the au contract period (7 years or over).

Long Term Hospitality Data Gift

Eligible models

  • 4G LTE Feature Phone (au VoLTE)
  • mamorino Watch

* This service is not supported on AQUOS K SHF31.

Universal service system

In accordance with the launch of the universal service system, subscribers of au phone services have been asked to pay a "universal service fee" from billing of January 2007.

Universal service system


[Unlimited Calling Plan S(Mobile phone)]

  • [1]
  • You can make unlimited domestic calls up to 5 minutes.
  • Flat-rate voice calls with this plan do not apply to voice calls to phone numbers starting with 0180, 0570 or other numbers that are charged by other carriers, voice calls to directory assistance (104), 1XY administration number services (188/189), SMS transmissions, voice calls to satellite phones/ship satellite phones, and voice calls to phone numbers that KDDI separately determines.
  • Calling charge discounts that are provided by "2-year contract (Smile-heart Discount or 2-year contract (No automatic renewal) ) + Family Discount" or "au → My Home Discount (if free)" are applied. Calling charge discounts that are provided by "au → My Home Discount (50% discounts)", "Smile-heart Discount", and other discount services are not applied. Calls that exceed 5 minutes incur a calling charge of ¥20/30 seconds.
  • Should KDDI judge, for example, that a continuous call for a long period of time is affecting KDDI equipment, the call in question may be terminated.
  • Numbers that are specified by KDDI (such as the ones that are connected when using a telephone service provided by a carrier other than KDDI, and the ones that are continuously connected for a specified period for long-term or multiple communications due to a call that originates by a mechanical nature) are not eligible for flat-rate calls.
    Click here for the numbers that are not eligible for flat-rate calls (in Japanese only) (41KB)PDF

[Flat-rate Data]

  • * For Two-step data flat Z(Mobile phone), data communications charges from overseas use are not eligible to be included in the fixed rate of the Flat-rate Data service. Two-step data flat for Overseas can only be applied when you are automatically connected to an eligible carrier.
  • * For Flat-rate Data 1 (Mobile phone), 3 (Mobile phone), and 5 (Mobile phone) users, when World Flat-rate Data is used overseas, the communications charge consumes the monthly data amount of the domestic Flat-rate Data service. If you are using Two-step data flat for Overseas, you will be charged for data communications used overseas. It is not included in the domestic monthly data amount.

[Application of Charges]

  • * If applying when making a new subscription or switching models, the rate plan and Flat-rate Data service become applicable from the date of subscription or the date of switching models (the basic charge/Flat-rate data charge is prorated). If changing the contract or switching to a model you bring to a shop, the service becomes applicable from the month following the month of the change or switch. If you cancel in the middle of a month, the rate plan and Flat-rate Data service charges are not prorated and the flat rate is incurred (If not subscribed to 2-year Contract or 2-year Contract (no automatic renewal), the basic charge is prorated.).
  • * Free call allowance in this plan is not eligible for sharing.
    "Carryover" course and "share" course (in Japanese only)
  • * Check for other costs arising from the contract at the store.

[Regulations of 4G LTE communication speed]

  • * If the total amount of communications of the month exceeds the data quantity for that month, the maximum communications speed for sending and receiving until the end of that month will be 128 kbps. (The communications speed constraint will be removed on the first day of the following month.) If you apply for the Extra Option, the communications speed constraint does not apply. Data quantities purchased with Data Charge can be used without any communications speed constraint.
  • * To avoid network congestion, a limit will be placed on the communications speed for a whole day if you have used more than 6GB over the three most recent days (not including the day on which the restriction is applied). The restricted speed will differ depending on data traffic conditions. The constraint applies regardless of the remaining data amount.
  • * Regardless of whether you are subscribed to a Flat-rate Data service, your line may be temporarily suspended if the cost of the packet communications you use becomes high.

[Communication amount notification]

<When using Flat-rate Data>

  • Customers are notified via SMS (C mail) when the remaining amount of their monthly data amount drops below 10% or reaches 0% during the current month.

<When using Data Charge>

  • Customers whose total monthly data quantity and purchased data quantity for a given month is 5%,1% or lower will be notified by email to the mail address registered to the au ID.
  • *The actual amount charged is calculated using the tax amount calculated from the total amount of the individual tax-excluded charges, and therefore may differ from the total of the individual tax-included charges.
  • 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)