Data Charge

Data Charge is a service for purchasing top-up data quantities in real time.

Monthly fee Application
Not required
* Only the fee for the charged amount is incurred


Even if you use the entire monthly data amount of your contracted data flat rate service/rate plan in the middle of a month, you can use data communication without speed restrictions by charging (purchasing) additional data.
You can also make a reservation to automatically charge your data before your monthly data amount runs out.

[Monthly data quantity]Data quantity under your contracted data (packet) flat-rate service/plan
[Purchased data quantity] Data quantity purchased using the Data Charge service


Point1The additional data quantity is valid for 62 days from the day of recharge so there is no waste.

If you have both monthly data quantity and purchased data quantity, the monthly data quantity is used first.

Validity period

Point2Data quantities can be added in units of 0.5GB and 1GB using Data Charge

Select the additional data quantity from 0.5GB or 1GB and add quantities according to your needs.

Point3Choose "Immediate" or "Reservation" for the charge timing

Set the charge timing and number of charges to match your usage conditions.

Usage condition Charge timing Number of charges
You want to charge immediately regardless of your remaining data amount or expiration date Immediately 1
You want to charge automatically before your remaining data amount runs out or before the expiration date Reservation (*) Choose from
1, 2, 3, 4, 5, or 12

(*) Depending on your contract status, you can choose (1) or (2) for the charge timing.

  • (1)When the remaining monthly data amount and purchased data amount reaches 1%, or when the expiration date of the purchased data amount has been reached
  • (2)When the expiration date of the purchased data amount has been reached
For example, if reserved

Eligible models and data flat rate services/rate plans

This service can be used when subscribed to one of the following data (packet) flat-rate services or rate plans.

Eligible models Eligible Flat-rate Data services/rate plans
4G LTE Smartphone
4G LTE feature phone

* Plans whose applications are no longer accepted

4G LTE Tablet
4G LTE capable PC
  • LTE Flat for DATA(m)
  • LTE Flat for DATA(m) ds
  • * The names of rate plans and data (packet) flat rate services for 4G LTE (au VoLTE) AndroidTM smartphones have "(V)".

Communication amount notification

When you run out of data quantity, a notification email will be sent to the email address registered to your au ID.

For details


  • * If you complete the application procedure to commence the Data Charge service between 8:00 AM and 9:00 PM, you can use the service immediately. If you apply at any other time, you can use the Data Charge service from 8:00 AM the next day. If you complete the procedures for a new contract, model change or additional terminal on the same day, you can use the Data Charge service from 8:00 AM the next day regardless of the time the application procedure is completed.
  • * An au ID is required to use the Data Charge service.
    (Click here (in Japanese only) to set your au ID / If you have forgotten your au ID or password, click here (in Japanese only))


  • * Safety Access Service / Restriction on Web Use are not available. Customers using these services must terminate the service (at au Shops). Use Security Filter for au.
    Security Filter for au (in Japanese only)
  • * Cannot be used in combination with the Extra Option.
    Extra Option
  • * Any remaining Data Charge quantity will become unusable if you terminate or suspend the service or plan, or change to another ineligible service or plan.

[Restrictions of communication speed]

  • * If the total amount of communications of the month exceeds the monthly data quantity, the maximum communications speed for sending and receiving until the end of that month will be 128kbps. (The communication speed restrictions will be removed on the first day of the following month.) Data quantities purchased with Data Charge can be used without any communications speed constraint.
  • * To avoid network congestion, a limit may be placed on the communication speed for a whole day if the total amount of communication used exceeds 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 restriction applies regardless of the remaining data amount.)
  • * Regardless of whether you are subscribed to a data (packet) flat-rate service, your line may be temporarily suspended if the cost of the packet communications you use becomes high.
  • * This is a best-effort service. The stated speed is the maximum value based on technical standards and does not indicate actual speed. The actual speed may fall substantially short of the maximum for various reasons including your use environment and the traffic conditions, even within service areas.
  • 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)