Google + may not have the following that Facebook has but it doesn’t mean Google doesn’t keep adding more features to make the service more alluring. Google + has SMS support so that people who still have feature phones can keep in touch while they aren’t online. Until now only people in the United Stated and India could take advantage of this feature. Now people in over 41 countries can keep in touch via SMS. With this option you can post to your circles and receive notifications.
Here in the US we take for granted that we have access to data and 3G/4G connections but people over in other parts of the world and emerging countries don’t have that of ubiquitous access. A majority of those users still have feature phone so this opens up another demographic of people who might be more inclined to use Google +.
To be able to use Google + via SMS you have to register your mobile number on your Google profile. Once that has been done you can determine what number you need to text by using Google’s support page. Google + now joins Facebook and Twitter in using SMS to stay connected on the go.
Source: Google India