This app is compatible with Android, iOS and Blackberry platforms.
There is also a web app implementation that works in Opera Mobile, which means that you can do Google Auth on Nokia (Symbian) phones. (May also work in IE on Windows Phone Nokias, haven't tried it.)
See this thread:
https://bitcointalk.org/index.php?topic=111943Thanks, I've added info about HTML5 version to the post.