can't change my apple id on phone
New phone; changed my apple id; can't change apple id on old or new phone. Help
Question marked as
What happens when you try? Error message(s)? More information would help.
If you have changed your ID or password, have you followed the steps in this article?
What to do after you change your Apple ID or password - Apple Support. https://support.apple.com/en-us/HT204071