You can now initiate Hangouts video conferencing sessions directly from Google+ for mobile
You already could do video conferencing through Google+ on smartphones, but the Hangouts session had to be initiated from a desktop computer. Google is launching a new version of Google+ for Android in the next few days, which will allow Hangouts sessions to be completely mobile, that is you can initiate a Hangouts video conference directly from your device. You simply touch the little camera button at the top to start a hangout. An updated version of Google+ for iOS devices is also coming soon.