You can access Google’s new social networking service,Google+, on your Android mobile phones using a native application.
Google+ for mobile makes sharing the right things with the right people a lot simpler. Huddle lets you send super-fast messages to the people you care about most. With your permission, Instant Upload automatically puts the photos and videos you take into a private album in the cloud, so you can share them anytime, from anywhere. And no matter where you are, the stream lets you stay in the loop about what your friends are sharing and where they’re checking in.
Here is a demonstration video of Google+ for Android.
Google will release a native app for iPhone soon and there is no word on when they are going to release Google+ for other mobiles like Windows Phone 7, BlackBerry and Nokia.
By the way you need invitation to access Google+ and you can request for one over here (more information on how to get Google+ Invite)
Download Google+ for Android from Market Place