What to do if the website returns "Connection Error" when adding a phone number
Troubleshooting steps for communication and transmission errors.
Before you can connect to the game servers, you must add a phone number to this account.
What to do if you get a "Something went wrong" error when logging in to the Battle.net Mobile App
How to create an account to play on the Public Test Realms
How to remove or change the phone number on your Battle.net account
How to resolve this error when trying to log in to Battle.net
Information on Battle.net Phone Notifications
Information about this error when adding a phone number or an Authenticator to a Battle.net account