If you ever loose regestration for face time, don’t folow apples instructions.
do this.
Use your apple id , whitch is you email account, then in the password field
use the password you use to buy things. That is you apple password.
Then go in to the facetime settings and check that your phone number is there.
That’s most of what you should do.
You can call me at 860-874-5495 or 413-310-2917 keep swinging
