When Google+ launched last summer, users in India and the United States were able to interact with their circles via SMS, however other territories have so far been left out of the text-based fun. That changes today, as Google+'s SMS features are rolled out to 41 new countries, mostly in the developing world --
Afghanistan, Algeria, Angola, Bahrain, Benin, Cambodia, Cameroon, Congo (DRC), Cote D'Ivoire, Egypt, Ghana, Guinea, Indonesia, Iraq, Israel, Jordan, Kazakhstan, Kenya, Kuwait, Kyrgyzstan, Liberia, Malawi, Malaysia, Maldives, Morocco, Mozambique, Niger, Nigeria, Pakistan, Philippines, Saudi Arabia, Senegal, Sierra Leone, Sri Lanka, Tanzania, Thailand, Tunisia, Uganda, Uzbekistan, Vietnam and Zambia.
The idea is to allow G+ members to interact in places where standard voice and SMS coverage is available, but mobile data is not. By texting a particular number on a supported carrier, users can post to their stream, either publicly, or to a specific circle. Likewise, any responses are fed back by text message.
A list of networks supporting these new SMS features can be found over on the Google+ support page.
Source: Google India Blog