You can use the prepaid service with your current au phone by simply purchasing and registering a prepaid card. This is very convenient if you want to make separate payments for business and personal calling charges.

Your current au phone + Prepaid card Your current au phone + Prepaid card

Calling charges and validated date

Calling cost

Service area

Weekday daytime (8:00 AM to 7:00 PM)
Weekend and holiday daytime (8:00 AM to 11:00 PM)

15 sec. / ¥10 (tax included) Nationwide Japan
Weekday nighttime (7:00 PM to 11:00 PM)
Late night / Early morning (11:00 PM to 8:00 AM)
14.5 sec. / ¥10 (tax included)

Prepaid card type

Available usage amount    

Available usage period *1

¥3,000 (non taxed)

¥3,300 (tax included)

365 days

¥5,000 (non taxed)

¥5,500 (tax included)

365 days

¥10,000 (non taxed)

¥10,000 (tax included)

365 days

Three Little Pigs card *2
(Card set with three ¥1,000 (non taxed) cards)

¥1,000/card (tax included)

365 days

  1. These fees are for usage with your current au phone.
  2. Only available at stores.

Available services

Calling overseas

You can make international calls by using KDDI 001 services without any subscription.

Calling charges (example)


Calling charges


12 sec. / ¥20 (tax exempt)

South Korea

9 sec. / ¥20 (tax exempt)

China (mainland and Hong Kong) & Taiwan

8 sec. / ¥20 (tax exempt)

England, Germany, France

6 sec. / ¥20 (tax exempt)

How to use

Switching to prepaid mode is easy!

  • 1

    Purchase a prepaid card.

  • 2

    Dial 1400

  • 3

    Following the voice guidance, register number on the back side of the card.

  • 4

    Just dial a phone number to get started!

  • Some models automatically attach 1401 for you.


  • If your registered balance reaches ¥0 during transmission or calling, you will be unable to use the service even if in the middle of a call.
  • You cannot use Email and EZweb through the prepaid service.
  • For calls using prepaid services are paid call detail will not be published.
  • Paid for calls using prepaid services, various discounts available.
  • Your prepaid service will terminate if you do not register a new card during the re-registration period.
  • Pripaid cards can be registered up to ¥10 at a time, can call 365 days period, the balance of ¥60,000 registration (tax included) can not exceed the registration.
  • You pay your monthly bills are not available.


Please review the FAQs before contacting Customer Center.

  • All of the indicated amounts include tax unless otherwise specified.
  • 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)