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

Information on Phone Number Not Eligible for Callback error

Information on the sms requirement for Call of Duty

Information on contacting Activision Support

Information about Factory Recon

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

Please don’t use this to uninstall. Use the Battle.net desktop app game options or the Windows Control Panel instead.

What to do if you corrected your country of residence in your account details but still you can't add your phone number to your account

Troubleshooting steps for communication and transmission errors.

How to access the Parental Control settings on an account