How can I log in or recover my account if my phone number has been deactivated?

Please update the app to the latest version, then on the login page, click on the "Help - Account Recovery" option in the top right corner. Fill in the required information as prompted, and after verification, you will be able to recover your account. (Note: If the Rednote account has already been canceled, recovery is not supported.)

The reply is from Rednote official,
If you have any questions, please contact Rednote official customer service