Question regarding

Q u o t e:
Authenticators. If our authenticator stop's working do we need to buy a new one?

You don’t need to buy a new one, Deathmetalzf, but you may wish to do so to keep the account secure.

At this time you can currently download the Mobile Authenticator application for free for use on the following devices:

• iPhone
  
• iPod Touch
  
• iPad
  
• Android

Alternatively, many cell phones are able to run the application as well. Please visit the following page to check if your cell phone qualifies. Keep in mind, compatibility also depends on your cell phone provider as well.

Mobile Authenticator Compatibility
http://mobile.blizzard.com/us-en/support-compat.html/