Please refer to the descriptions provided either to the right of or below the images for an explanation of each step
(When configuring multi-factor authentication on a second or subsequent device, you may skip the operations in this step, as the setup has already been completed.)
1.1. Access keio.jp
Access keio.jp( https://keio.jp )using your smartphone browser and log in with your keio.jp account (ID and password).
1.2. Tap "Set up" in the "Phone" section.
(Even if you can no longer use the app due to changing devices, please set up phone authentication so you can recover your login yourself.)
1.3. Set up phone authentication
To register via SMS: Select "SMS," set the Country/Region to "Japan," enter your phone number, and tap "Receive code via SMS."
To register via Voice Call: Select "Voice call," set the Country/Region to "Japan," enter your phone number, and tap "Receive code via voice call." (Note: Please leave the extension number field blank if it appears.)
[If you do not receive the authentication SMS (Short Message)]
Spam filters or "Unknown Sender Screening" features may be enabled.
Please refer to the manual provided by your carrier and check your settings.
・Docomo（日本語/Japanese）
https://www.docomo.ne.jp/info/spam_mail/sms/
・au （日本語/Japanese）
https://www.au.com/mobile/service/sms/filter/
・Softbank（日本語/Japanese）
1.4. Set up phone authentication
Enter the verification code sent to your registered phone number (6 digits for SMS or 5 digits for voice call) and tap "Verify."
1.5. Proceed to the Set up security methods screen and confirm that the “Continue” button is displayed.
If the “Continue” button appears below the security method setup screen, your phone-based multi-factor authentication setup is complete. Tap “Continue” to log in to keio.jp.
End of guide