How to set up the same Authenticator on more than one device.
What to do if you receive this error on the mobile Battle.net app
What to do if you don't receive texts from Blizzard
How to resolve this error when adding your phone to your Battle.net account
Troubleshooting steps for missing notifications on the Battle.net Mobile App
Troubleshooting steps for disconnection problems with the Battle.net mobile app
What to do if you can't resync your authenticator.
What to do if the verification code received via SMS doesn't work
Minimum OS requirements for the Battle.net Mobile App
What to do if you get a "Something went wrong" error when logging in to the Battle.net Mobile App