If you can't be bothered to fumble with Blizzard's keychain or mobile app authenticators for World of Warcraft, they're now offering a third option: dial-in authentication. This method requires you to call a toll-free number to input a personal ID number if there is an unusual login attempt being made with your account (logging on from a different computer, for example).
Currently, dial-in authentication only works for US residents and isn't compatible with StarCraft II yet. All the details you need to know are in the source link but if you want sign up right way, the option will show up under "Security Options" when you've logged into Battle.net Account Management.
Source:Blizzard Support
Section:PC Games
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