Gmail (for iPhone)  Gmail (for iPhone) Prior to the re-release
of the iOS Gmail app from Google, badges and notifications were
not functioning. Since Nov. 15, 2011, they are now enabled.
Toggle them on from your iOS device's Settings panel. 5 / 5
Bottom Line  The standalone Gmail app for iOS searches your
entire email so much easier and faster than the pre-installed
Mail app, it's definitely a recommended download, and could very
easily become your primary app for Gmail.