Deregister phone number in iMessage & FaceTime
Good morning, I have recently changed my iPhone and phone number. Unfortunately I do no longer have my old iPhone and my old SIM card.
On my Apple ID settings page it appears that I can still be reachable at the old phone number. I cannot delete it, because it says that it is still being used for iMessage & Facetime.
How can I deregister my old number from iMessage & FaceTime? I have already tried in changing Apple ID password, but...nothing.
Anyone has any idea?
Thanks
iPhone 7