Authenticators to be required to play WoW?

[Mordekhuul]

Annie and I both have a separate authenticator and the phone app for our iPhones. While the authenticator was ok we both prefer the phone app since we always have our phones handy. No complaints about it from us. :)

Can the phone app and authenticator token both be used interchangeably, or is it one or the other? My wife and I have authenticators, but we also both have iPhones, so it'd be nice to enable it there as well, but not if it means we can't use the tokens when our iPhones aren't handy, etc.