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.
Blizzard servers could not be reached or may be offline.
What to do if you receive this error when attempting to add your phone number to your Battle.net Account.
A phone number can only be linked to one free game
Information regarding game crashes on specific Android devices for Warcraft Rumble and Hearthstone
How to resolve the error: "There was an error with your migration contact Customer Support"
It is not possible to remove the Battle.net Authenticator from an account with Battle.net Balance