Can the ID of Apple's mobile phone be hidden?

As long as you don't cancel the Apple ID on your mobile phone, it can reveal some of your privacy through cloud services, such as photos, phone books, text messages and emails, if others don't brush it (for example, if it is lost).

When you were selling your mobile phone, you cancelled Apple's account in advance and deleted the phone book and important information, so even if others want to restore it, it won't work because there is no Apple account and password for you.