Some games require that you add a phone number to your Battle.net account

How to contact the Blizzard legal department.

What to do when you receive an error when adding a phone number to your Battle.net account

Information on Phone Number Not Eligible for Callback error

What to do if you receive this error when attempting to add your phone number to your Battle.net Account.

Information on the sms requirement for Call of Duty

What to do if you don't receive texts from Blizzard

Information on why you might receive this error when sending a message to a Battle.net friend.

Why does the SMS verification sends the authentication code to a different number

What to do if you are unable to add your phone number because the wrong country code is showing.