menu

  • 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)

x

When is data transmission speed reduced?

Plans for 5G devices

When is data transmission speed reduced?（Plans for 5G devices）

Data transmission speed is the reduction of the data transmission speed (such as internet searches and video playback) to lower than usual. 

The conditions and contents may vary depending on the plan, so please check the following.

Important notes

  • For au customers

    New reservations acceptance for World Data Flat have ended on March 15th, 2024. If you have made a reservation before March 15th, please see this page.

    If you are using au Unlimited Data Overseas, your data transmission speed may be restricted if a large amount of data is used within a certain period (24 hours).

  • For UQ mobile customers

    You can continue using World Data Flat after March 15th, 2024. Please see this page.

Unlimited MAX 5G/Data MAX 5G

  • Data MAX 5G is no longer accepting new applications.
  1. When the monthly data allowance is exceeded

    For this plan, there is no upper limit for using data on your smartphone within Japan.

    • The total amount of data available for tethering, data sharing, and World Data Flat is up to 30GB.

    • When exceeded, the transmission speed for tethering, data sharing, and World Data Flat will be 128kbps.
  2. When a large amount of data is used within a certain period

    Data transmission speed reduction will be applied during peak hours.

  3. When using services that require a large amount of data or long-time connection, such as video streaming or cloud games

    Data transmission speed reduction will be applied during network congestion.

Unlimited MAX 5G DAZN pack/Unlimited MAX 5G Netflix pack (P)/Unlimited MAX 5G with Amazon Prime/ Data MAX 5G Netflix pack

  • Data MAX 5G Netflix pack is no longer accepting new applications.
  1. When the monthly data allowance is exceeded

    For this plan, there is no upper limit for using data on your smartphone within Japan.

    • The total amount of data available for tethering, data sharing, and World Data Flat is up to 60GB.

    • When exceeded, the transmission speed for tethering, data sharing, and World Data Flat will be 128kbps.
  2. When a large amount of data is used within a certain period

    Data transmission speed reduction will be applied during peak hours.

  3. When using services that require a large amount of data or long-time connection, such as video streaming or cloud games

    Data transmission speed reduction will be applied during network congestion.

Unlimited MAX 5G Drama-Variety Pack/Data MAX 5G Drama-Variety Pack

  • Data MAX 5G Drama-Variety Pack is no longer accepting new applications.
  1. When the monthly data allowance is exceeded

    For this plan, there is no upper limit for using data on your smartphone within Japan.

    • The total amount of data available for tethering, data sharing, and World Data Flat is up to 70GB.

    • When exceeded, the transmission speed for tethering, data sharing, and World Data Flat will be 128kbps.
  2. When a large amount of data is used within a certain period

    Data transmission speed reduction will be applied during peak hours.

  3. When using services that require a large amount of data or long-time connection, such as video streaming or cloud games

    Data transmission speed reduction will be applied during network congestion.

Unlimited MAX 5G ALL STAR Pack 2/Unlimited MAX 5G ALL STAR Pack/Data MAX 5G ALL STAR Pack

  • Unlimited MAX 5G ALL STAR Pack and Data MAX 5G ALL STAR Pack is no longer accepting new applications.
  1. When the monthly data allowance is exceeded

    For this plan, there is no upper limit for using data on your smartphone within Japan.

    • The total amount of data available for tethering, data sharing, and World Data Flat is up to 80GB.

    • When exceeded, the transmission speed for tethering, data sharing, and World Data Flat will be 128kbps.
  2. When a large amount of data is used within a certain period

    Data transmission speed reduction will be applied during peak hours.

  3. When using services that require a large amount of data or long-time connection, such as video streaming or cloud games

    Data transmission speed reduction will be applied during network congestion.

Pitatto Plan 5G

  • Pitatto Plan 5G is no longer accepting new applications.
  1. When the monthly data allowance (7GB) is exceeded

    The transmission speed for sending and receiving data will be up to 128kbps until the end of the month.

  2. When a large amount of data is used within a certain period

    Data transmission speed reduction will be applied during peak hours.

Smartphone Mini Plan 5G

  1. When the monthly data allowance (4GB) is exceeded

    The transmission speed for sending and receiving data will be up to 300kbps until the end of the month.

    • At the beginning of the service, the speed will be 128kbps. From April 2023, it is being gradually changed to a maximum of 300kbps.
  2. When a large amount of data is used within a certain period

    Data transmission speed reduction will be applied during peak hours.

Smartphone Start Plan 5G

  1. When the monthly data allowance (20GB) is exceeded

    The transmission speed for sending and receiving data will be up to 128kbps until the end of the month.

  2. When a large amount of data is used within a certain period

    Data transmission speed reduction will be applied during peak hours.

Smartphone Start Plan Light 5G

  1. When the monthly data allowance (4GB) is exceeded

    The transmission speed for sending and receiving data will be up to 128kbps until the end of the month.

  2. When a large amount of data is used within a certain period

    Data transmission speed reduction will be applied during peak hours.

    • For more information about the Smartphone Start Plan Light 5G,click here (in Japanese only)

Smartphone Start Plan (S) 5G/Smartphone Start Plan (Flat) 5G

  • Smartphone Start Plan (Flat) 5G and Smartphone Start Plan (S) 5G are no longer accepting new applications.
  1. When the monthly data allowance (3GB) is exceeded

    (5GB Smartphone Start Plan (S) 5G with the "2GB Increase Option" currently applied)

    (5G Smartphone Start Plan (Flat) 5G with the "U22 Data Increase Campaign" currently applied)

    The transmission speed for sending and receiving data will be up to 128kbps until the end of the month.

  2. When a large amount of data is used within a certain period

    Data transmission speed reduction will be applied during peak hours.

For your reference

  • As of September 1st, 2023, read TV Pack as Drama-Variety Pack.

  • This page provides an overview of the data transmission speed reduction. For more details, please refer to each plan page.
    Click
    here
    to check current plans.
    Click
    here
    for past plans which application acceptance has ended. (in Japanese only)
    Click
    here
    regarding data transmission speed restriction for the World Data Flat.

Plans for 4G LTE devices

When is data transmission speed reduced?（Plans for 4G LTE devices）

Data transmission speed is the reduction of the data transmission speed (such as internet searches and video playback) to lower than usual. The conditions and contents may vary depending on the plan, so please check the following.

Important notes

  • For au customers

    New reservations acceptance for World Data Flat have ended on March 15th, 2024. If you have made a reservation before March 15th, please see this page.

    If you are using au Unlimited Data Overseas, your data transmission speed may be restricted if a large amount of data is used within a certain period (24 hours).

  • For UQ mobile customers

    You can continue using World Data Flat after March 15th, 2024. Please see this page.

Unlimited MAX 4G/Data MAX 4G LTE/au Data MAX Plan Pro

  • Data MAX 4G LTE and au Data MAX Plan Pro are no longer accepting new applications.
  1. When the monthly data allowance is exceeded

    For this plan, there is no upper limit for using data on your smartphone within Japan.

    • The total amount of data available for tethering, data sharing, and World Data Flat is up to 30GB.

    • When exceeded, the transmission speed for tethering, data sharing, and World Data Flat will be 128kbps.
  2. When a large amount of data is used within a certain period

    Data transmission speed reduction will be applied during peak hours.

  3. When using services that require a large amount of data or long-time connection, such as video streaming or cloud games

    Transmission speed will be restricted within the range that does not interfere with general usage on 4G smartphones (examples: Watching streaming videos in HD quality, etc.). Transmission service will not be disconnected.

Unlimited MAX 4G DAZN Pack/Unlimited MAX 4G Netflix Pack (P)/Data MAX 4G LTE Netflix Pack

  • Data MAX 4G LTE Netflix Pack is no longer accepting new applications.
  1. When the monthly data allowance is exceeded

    For this plan, there is no upper limit for using data on your smartphone within Japan.

    • The total amount of data available for tethering, data sharing, and World Data Flat is up to 60GB.

    • When exceeded, the transmission speed for tethering, data sharing, and World Data Flat will be 128kbps.
  2. When a large amount of data is used within a certain period

    Data transmission speed reduction will be applied during peak hours.

  3. When using services that require a large amount of data or long-time connection, such as video streaming or cloud games

    Transmission speed will be restricted within the range that does not interfere with general usage on 4G smartphones (examples: Watching streaming videos in HD quality, etc.). Transmission service will not be disconnected.

Unlimited MAX 4G Drama & Variety Pack/Data MAX 4G LTE Drama & Variety Pack

  • Data MAX 4G LTE Drama & Variety Pack is no longer accepting new applications.
  1. When the monthly data allowance is exceeded

    For this plan, there is no upper limit for using data on your smartphone within Japan.

    • The total amount of data available for tethering, data sharing, and World Data Flat is up to 70GB.

    • When exceeded, the transmission speed for tethering, data sharing, and World Data Flat will be 128kbps.
  2. When a large amount of data is used within a certain period

    Data transmission speed reduction will be applied during peak hours.

  3. When using services that require a large amount of data or long-time connection, such as video streaming or cloud games

    Transmission speed will be restricted within the range that does not interfere with general usage on 4G smartphones (examples: Watching streaming videos in HD quality, etc.). Transmission service will not be disconnected.

Pitatto Plan 4G LTE (New au Pitatto Plan N)/New au Pitatto Plan

  • Pitatto Plan (4G LTE) and New au Pitatto Plan are no longer accepting new applications.
  1. When the monthly data allowance (7GB) is exceeded

    The transmission speed for sending and receiving data will be up to 128kbps until the end of the month.

  2. When a large amount of data is used within a certain period

    Data transmission speed reduction will be applied during peak hours.

au Pitatto Plan

  • Pitatto Plan is no longer accepting new applications.
  1. When the monthly data allowance (20GB) is exceeded

    The transmission speed for sending and receiving data will be up to 128kbps until the end of the month. 

  2. If you have used 6GB or more of data in the last 3 days (not including the current day)

    Data transmission speed reduction may apply all day long.

Smartphone Mini Plan 4G

  1. When the monthly data allowance (4GB) is exceeded

    The transmission speed for sending and receiving data will be up to 300kbps until the end of the month.

    • At the beginning of the service, the speed will be 128kbps. From April 2023, it is being gradually changed to a maximum of 300kbps.
  2. When a large amount of data is used within a certain period

    Data transmission speed reduction will be applied during peak hours.

Smartphone Start Plan 4G

  1. When the monthly data allowance (20GB) is exceeded

    The transmission speed for sending and receiving data will be up to 128kbps until the end of the month.

  2. When a large amount of data is used within a certain period

    Data transmission speed reduction will be applied during peak hours.

Smartphone Start Light Plan 4G

  1. When the monthly data allowance (4GB) is exceeded

    The transmission speed for sending and receiving data will be up to 128kbps until the end of the month.

  2. When a large amount of data is used within a certain period

    Data transmission speed reduction will be applied during peak hours.

    • For more information about the Smartphone Start Plan Light 4G, please click here (in Japanese only)

Smartphone Start Plan (S) 4G & Smartphone Start Plan (Flat) 4G

  • Smartphone Start Plan (Flat) 4G and Smartphone Start Plan (S) 4G are no longer accepting new applications.
  1. When the monthly data allowance (3GB) is exceeded

    (5GB if "2GB Increase Option" is applied for Smartphone Start Plan (S) 4G )　

    (5GB if "U22 Data Increase data Campaign" is applied for Smartphone Start Plan (Flat) 4G)

    The transmission speed for sending and receiving data will be up to 128kbps until the end of the month.

  2. When a large amount of data is used within a certain period

    Data transmission speed reduction will be applied during peak hours.

au Flat Plan 7 Plus N/au Flat Plan 7 Plus

  • au Flat Plan 7 Plus N and au Flat Plan 7 Plus are no longer accepting new applications.
  1. When the monthly data allowance (7GB) is exceeded

    The transmission speed for sending and receiving data will be up to 300kbps until the end of the month.

  2. When a large amount of data is used within a certain period

    Data transmission speed reduction will be applied during peak hours.

au Flat Plan 20N/au Flat Plan 25 Netflix Pack N/au Flat Plan 20/au Flat Plan 25 Netflix Pack

  • au Flat Plan 20N, au Flat Plan 25 Netflix Pack N, au Flat Plan 20, and au Flat Plan 25 Netflix Pack are no longer accepting new applications.
  1. When the monthly data allowance (20GB/25GB) is exceeded

    The transmission speed for sending and receiving data will be up to 128kbps until the end of the month.

  2. If you have used 6GB or more of data in the last 3 days (not including the current day)

    Data transmission speed reduction may apply all day long.

au Data MAX Plan

  • au Data MAX Plan is no longer accepting new applications.
  1. When the monthly data allowance is exceeded

    For this plan, there is no upper limit for using data on your smartphone within Japan.

    • The total amount of data available for tethering, data sharing, and World Data Flat is up to 20GB.

    • When exceeded, the transmission speed for tethering, data sharing, and World Data Flat will be 128kbps.
  2. When a large amount of data is used within a certain period

    Data transmission speed reduction will be applied during peak hours.

  3. When using services that require a large amount of data or long-time connection, such as video streaming or cloud games

    Transmission speed will be restricted within the range that does not interfere with general usage on 4G smartphones (examples: Watching streaming videos in HD quality, etc.). Transmission service will not be disconnected.

au Data MAX Plan Netflix Pack

  • au Data MAX Plan Netflix Pack is no longer accepting new applications.
  1. When the monthly data allowance is exceeded

    For this plan, there is no upper limit for using data on your smartphone within Japan.

    • The total amount of data available for tethering, data sharing, and World Data Flat is up to 2GB.

    • When exceeded, the transmission speed for tethering, data sharing, and World Data Flat will be 128kbps.
  2. When a large amount of data is used within a certain period

    Data transmission speed reduction will be applied during peak hours.

  3. When using services that require a large amount of data or long-time connection, such as video streaming or cloud games

    Transmission speed will be restricted within the range that does not interfere with general usage on 4G smartphones (examples: Watching streaming videos in HD quality, etc.). Transmission service will not be disconnected.

For plans other than the above

  1. When the monthly data (varies by plan) allowance is exceeded

    The transmission speed for sending and receiving data will be up to 128kbps until the end of the month. 

  2. If you have used 6GB or more of data in the last 3 days (not including the current day)

    Data transmission speed reduction may apply all day long.

For your reference

  • As of September 1st, 2023, read TV Pack as Drama-Variety Pack.

  • This page provides an overview of the data transmission speed reduction. For more details, please refer to each plan page.
    Click
    here
    to check current plans.
    Click
    here
    for Discontinued Plans. (in Japanese only)
    Click
    here
    regarding data transmission speed reduction for the World Data Flat.
詳しく

Has your problem been solved?

Yes
No
詳しく
  • All of the indicated amounts exclude tax unless otherwise specified.
Site Map Introduction of au ID About au Brand KDDI HOME Business Corporate Information KDDI Site Map
Site Policy Privacy Policy Disclaimer Operating Environment・Cookie Information About Trademarks

COPYRIGHT © KDDI CORPORATION, ALL RIGHTS RESERVED.