The Battle.net Authenticator now lives inside the Battle.net mobile app: https://play.google.com/store/apps/details?id=com.blizzard.messenger
With two-factor authentication, including one-touch button to approve or deny login attempts, you can keep everything protected--from your most storied World of Warcraft characters to your meticulously crafted Hearthstone decks. The Authenticator app provides a one-touch button experience so you can approve or decline any login attempt. With the Mobile Authenticator, you can rest easy knowing that your Battle.net account is more secure.
Internet connection required. For more information on how to add the Battle.net Authenticator to your account, visit https://blizzard.com/support/article/24520.
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