In firmware version 83, Yealink introduced the feature 'Warning Display'
Yealink IP phone support displaying a warning icon in the status bar, and warning information on the Status screen when the default password is used. It is used to remind users to change the default password as soon as possible.
As General Data Protection Regulation required, there should be a warning icon in the status bar warning information on the Status screen when the default password is used. You can go to Settings -> Status -> General on the phone user interface to disable the phone to display warnings.
We strongly advise to change the default password in the phones for safety matters instead of just disabling the display warning.