Remove phone number from Apple ID
It says to keep using my old number on my Apple ID but I have a new number
iPhone 12 Pro Max, iOS 14
uriel0801 Said:
"Remove phone number from Apple ID: It says to keep using my old number on my Apple ID but I have a new number"
-------
Add/Remove Numbers:
Start by adding the new number as a second number, and then remove this current number. Your new one show remain. As the above link reads: "if you don't have access to your iPhone, you can deregister iMessage online."