The setup and user interface of the Google+ app is pretty straightforward. It includes the same Profile, Stream, Photos, and Circles found on your Google+ web account. You can write and read posts to and from all of your circles, or tap to selectively view individual circles.
You can also share photos from your Photo Library or ones you snap from within the application. In addition, you can see posts from other Google+ members who live nearby, and “Incoming” posts from your circles.
The app also makes use of the swipe finger gesture of the iPhone, enabling you to switch between the three different menus.
Oddly enough, iOS Google+ is only compatible with the iPhone running iOS 4 or later.