NTT DoCoMo has warned about a phishing email regarding “temporary suspension of use of d account” disguised as the company. There have been reports of cases where you are asked to enter personal information such as d-account ID and password, credit card and bank account information when you access the link provided in the body of the email. When a suspicious email is received, the email is deleted and the link is not accessed. When the company notifies you about the suspension of use of the d account, send it by e-mail only from message R or SMS to users who have a line contract of the company, and from “email@example.com” to users who do not have a line contract. ing. In order to prevent unauthorized access to the d account, the company has set password invalidation using biometric authentication, set two-step verification that requires login with the application and input of security code, and is difficult to guess from a third party. We recommend setting and managing proper IDs and passwords that cannot be found.