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.
Troubleshooting PayPal payment issues
A phone number can only be linked to one free game
Information on how to request a correction of your account information.
What to do if the website returns "Connection Error" when adding a phone number
The Blizzard App will launch but will indefinitely load the games information with the message, "Loading Account Information."
Before you can connect to the game servers, you must add a phone number to this account.
How to create an account to play on the Public Test Realms