How to remove or change the phone number on your 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.
How to pay with an alternate PayPal account