How to remove or change the phone number on your Battle.net account
How to move a StarCraft II account off a Battle.net account
How to correct an email mistake when creating or updating your Battle.net account
Information on where to update your Activsion Account Email
It is not possible to move a Call of Duty account to another Battle.net account
A BattleTag can only be updated for free once
How to change or update a Battle.net account email address.
What to do if your Activision account has been compromised.