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au customer support information, one of the reasons that au is the carrier with the highest customer satisfaction rate in Japan

Mobile Phones

Customer support information for mobile phone use


Please review the FAQs before contacting Customer Center.

Inquiries about au mobile communication services

By phone

Open: 9:00 – 20:00 *1

English 0120-959-472 (Toll Free)
Portuguese 0120-959-473 (Toll Free)
Chinese 0120-959-476 (Toll Free)
Korean 0120-959-478 (Toll Free)
Japanese 157 (Toll Free) from au phones
0077-7-111 (Toll Free)
Follow the Japanese Voice Guidance and press the appropriate number.
You can choose to be connected to an operator for your inquiry. Outside of normal business hours, the interactive voice response system (IVR, Japanese Only) is available for assistance.

*1 Support for theft and loss of au mobile phones is available 24 hours a day.

By e-mail

Make an inquiry by mail

Click here for inquiry by e-mail.

Necessary items when purchasing a mobile phone or signing a contract

What do I need to start a new contract?

By visiting our store

Use the Store Locator to find a store with multiple language support.

User manuals by product

User manual download


Customer support information for internet use

Information on Maintenance and Obstructions

Information on Maintenance and Obstructions (in Japanese Only)

"au one net" Self Page will be shut down every Wednesday between 2:00 am and 10:00 am due to regular maintenance. Thank you for your cooperation. For further details, call the Customer Service Center.

"au one net" Support Desk

"au one net" Support Desk (in Japanese Only)

Check here to see details of your contract and learn how to make changes.This site also provides instructions for configuring in-home equipment. PCs or other devices.

Customer Service Center (in Japanese Only)

  • Customer Service Center

    0077-7084 (toll-free)
    From 9:00 to 20:00 (365 days a year)

  • Others

    0077-777 (toll-free)
    From 9:00 to 20:00 (365 days a year)

For Inquiry via e-mail,click here.