Twitter continues to find new mobile carriers to partner with across the globe. The latest addition is Bharti Airtel, which operates in India and reaches 110 million people. This from the Twitter blog post:
Our partnership with Bharti Airtel, the largest mobile operator in India, means a huge population of people can now send tweets at standard rates and receive tweets for free. Bharti Airtel is offering people in every city, every village, every remote taluk and even the smallest panchayat the opportunity to connect to Twitter and enjoy the open exchange of information with no added fees.
They then go on and talks about how Twitter is about people, which certainly have been proven true over the past year.