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The Battle.net Mobile Authenticator is for those iPhone users with World of Warcraft accounts. The Battle.net authenticator is linked to your Battle.net account and World of Warcraft account. With the authenticator active on your account after entering your password you are prompted for a code. The code is found on your iPhone, this code also rotates every 30 seconds so that it is very hard for your WoW account to get comprimised. Here is a shot of the app below.
You can find out more information on how to add this app to your Battle.net account at this link. Oh yeah, this app is FREE!
You can purchase the App or see if it is available for your phone Here.