Deregister imessage/facetime of old number
I want to remove my old phone number that is showing up on my new iPhone. I no longer have my old iPhone as I sent it to Verizon for trade-in.
The online tool https://selfsolve.apple.com/deregister-imessage/ is useless because it sends a code to the phone number of the phone to which I no longer have access.
iPhone 12 Pro Max, iOS 14