How to change Apple id
How to change iCloud account
If you have changed your ID, have you followed the steps in this article? Make sure you turn off Find My Phone before signing out of the old ID. Once signed out and Find My Phone is off, then sign in with the new ID, then turn Find My Phone back on.
What to do after you change your Apple ID or password - Apple Support. *. I suggest you do this before changing the ID and/or password.
