authenticator-iphone
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Battle.net authenticators limited to one account
Blizzard is changing up the security on their authenticators a bit. This isn't a major change and shouldn't affect that many people. Starting now, if you happen to have multiple Battle.net accounts (not multiple WoW accounts under one Battle.net account), then each account must have its own authenticator. This means if you have separate Battle.net logins for zergrush@somedomain.com and taurenfever@example.com and you want to use an authenticator, you'll need to buy two. If you've just got taurenfever@example.com and all of your games are under that Battle.net login, then you're perfectly fine. This is not retroactive. If you already have two accounts linked to a single authenticator, everything will still work as it does right now until you unlink that authenticator. The full blue post detailing the changes is behind the cut below.
Reminder: Save your mobile authenticator serial number before you upgrade your iPhone
If you're using a mobile authenticator on any kind of phone or mobile device, it's important to remember that it's fairly easy to ensure that you can use it again quickly after the phone gets any sort of update or patch. All you need to do is write down the serial number of the authenticator application you have on your phone. This way, if you need to deauthorize for any reason (or an update causes any issues) you can do so quickly and easily at battle.net without having to wait for a phone service call or what have you. This is particularly important for those folks getting the latest iPhone OS, iOS 4. If the upgrade goes haywire for any reason, you'll likely lose all your data off the phone; including the authenticator serial number. This means if you're going to upgrade your iPhone, iPod Touch, or iPad to iOS 4, you must write down your authenticator serial number to be safe.
