As of August 4, 2026, at 09:00, regular use of phone authentication (SMS and voice calls) for sign-in has been discontinued.
Phone authentication (SMS and voice calls) will no longer be available as an authentication method used together with your password when signing in to keio.jp services through a web browser or similar means.
If you were unable to add alternative authentication factors or switch your authentication method by the time above, please refer to the pages below.

• About MFA Setup
• How to Re-register Authentication Factors Using Phone Authentication (Japanese page)

For inquiries regarding this matter:

• Inquiry Form for IT-Related Topics

• Important information from the Office of Student Services will be posted on “K-Support” or “Student Website”. Please refer here (keio.jp account required) for instructions on how to use K-Support.
• Please click here to see the usage manual for Keio University Student Website. If the menu is not displayed correctly, try to clear the browser's cache.