Right from day one, an Android App of Google+ has already been available for download at the Android Market, but initially just in the US.
A couple of days ago, there was actually a workaround in installing the app outside US (courtesy of XDA Developers), through manual installation of an .apk file on your Android device, but it’s quite tricky particularly to those who don’t want to mess their handsets. It’s good thing though the official Google+ Android App is already available for download here in the Philippines. If you got an Android device, just check out the app at the Android Market, or you can also get it by logging in to Android Market website in your PC.
For iPhone users here in the country, it’s not yet officially available for download at Philippine App Store but you can actually get it by following the instructions here.