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Security PrecautionsSecurity Precautions
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July 21,2021
- au
(Updated October 11, 2022) Beware of fake SMSs posing as KDDI, public organizations, etc. (in Japanese only)
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May 18,2022
- au
- Please beware of any fake E-mail messages feigning au PAY or other KDDI affiliates' service or notifying you of any unpaid KDDI bills. (in Japanese only)
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December 25,2020
- au
- Please beware of any suspicious E-mail messages sent feigning delivery services, financial institutions, mobile phone carriers, or other companies. (in Japanese only)
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Service Brand Security Measures
Read about the security services available with the brand you are using.
Accessing a link (URL) in an E-mail spam or calling back a fraudulent number may entangle you in fraud. Opening a file attached to a suspicious E-mail may cause your device to be infected by malware.
Case studies of E-mail spam
Read about actual cases and characteristics of E-mail spam and scam reported from our customers.
- Common recent cases of E-mail spam and scam (in Japanese only)
Protection against SMS/E-mail spam
The following are useful apps and services for protecting you from SMS/E-mail spam.
| au mobile phone users: |
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| au one net users: |
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SMS/E-mail spam report
Please report any SMS/E-mail spam that you received to the contacts below. The information we receive will be used for improving the accuracy of the spam filter.
- E-mail spam report (in Japanese only)
- SMS (C-mail) spam report (in Japanese only)
- + message report (in Japanese only)
Precautions for dealing with phishing
Here are some precautions and how to deal with phishing in order to avoid getting your IDs and passwords stolen on a fake site designed to resemble official sites.
- To protect yourself from falling victim to phishing (in Japanese only)
Effective measures against unauthorized login to au ID
Introducing "login settings using fingerprint/face authentication" which is effective in preventing unauthorized logins.
- About login settings using fingerprint/face authentication (in Japanese only)
Fraudulent calls feigning a public officers or relatives or luring callbacks for one-ring calls have been reported.
These frauds can lead to being swindled money or charged a high calling fee. For a detailed explanation, click 
here (in Japanese only).
Protection against spam calls
The following are useful apps and services for protecting you from spam and fraudulent calls.
| au mobile phone users: |
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| au Hikari calling service users: |
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Accessing a link (URL) in an E-mail spam or calling back a fraudulent number may entangle you in fraud. Opening a file attached to a suspicious E-mail may cause your device to be infected by malware.
E-mail spam report
Please report any E-mail spam that you received to the contact below.
- E-mail spam reporting contact (in Japanese only)
Protection against SMS/E-mail spam
The following are useful apps and services for protecting you from SMS/E-mail spam.
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How to set up your spam filter (in Japanese only)
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SMS block function (in Japanese only)
- Spam message/call blocker (in Japanese only)
Precautions for dealing with phishing
Here are some precautions and how to deal with phishing in order to avoid getting your IDs and passwords stolen on a fake site designed to resemble official sites.
- To protect yourself from falling victim to phishing (in Japanese only)
Effective measures against unauthorized login to au ID
Introducing "login settings using fingerprint/face authentication" which is effective in preventing unauthorized logins.
- About login settings using fingerprint/face authentication (in Japanese only)
Fraudulent calls feigning a public officers or relatives or luring callbacks for one-ring calls have been reported.
These frauds can lead to being swindled money or charged a high calling fee. For a detailed explanation, click here (in Japanese only).
Protection against spam calls
The following are useful apps and services for protecting you from spam and fraudulent calls.
- Spam message/call blocker (in Japanese only)
- Spam call prevention service (for users subscribed to 5G rate plan) (in Japanese only)
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Spam call prevention service (for users subscribed to 4G LTE rate plan) (in Japanese only)
Read about security control available with povo.
Protection against SMS spam
The following are useful apps and services for protecting you from SMS/E-mail spam.
- SMS spam blocker (in Japanese only)
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Spam message/call blocker (in Japanese only)
Web filtering
The following are Web filtering services offered for your children's safe use.
- Anshin Filter for au (in Japanese only)
- Web filter for minors (in Japanese only)
Useful information
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Account sharing is dangerous? Account trading is illegal? 5 rules to prevent unexpected troubles (in Japanese only)
2019.05.31
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Can you catch out phishing attempts? Case studies and tricks: A guide to identifying fake sites and taking precautions (in Japanese only)
2019.06.13
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Creating a secure password: Password leak precautions, password manager apps, and leak checking methods (in Japanese only)
2019.07.26
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What is a 2-step verification that prevents account hijacking? Mechanism and setup technique explained (in Japanese only)
2019.09.10
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Two-step verification is not flawless? How phishing penetrates systems and countermeasures against attacks (in Japanese only)
2019.10.21
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Preventing rapidly increasing fraud cases: au's security measure "Spam message/call blocker" (in Japanese only)
2021.04.06
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What is phishing on smartphones? Tricks taking advantage of human psychology and protecting yourself from them (in Japanese only)
2020.09.07