Put new sim in iPhone 7 ported old number.
Changed carriers,put new sim in,new carrier ported old number over.Old number works for calls but new number shows for iMessage and FaceTime but cannot change it.Apple ID account shows old number.
So in essence I need to get rid of the new sim number from iMessage etc but cannot do it either via phone,account,support etc As they do not cover this problem
iPhone 7, iOS 13