How to deregister an old phone number that is still listed in my iMessage in place of my actual (current) phone number?
I have followed the instructions the best I can for deregistering an iMessage phone number. But can I do if I no longer have my old SIM card and my previous phone number's country is not listed for deregistering using a code?...then how do I deregister the number from iMessage? I am stuck now in another country, trying to use iMessage on my iPhone, but cannot because it keeps trying to register iMessage with an old number from another country rather than my current phone number/SIM.
Thanks!
iPhone 6s Plus, iOS 12