Twitter has partnership with Airtel recently. Now, anyone can send tweet using the Airtel mobile from anywhere in India. Tweet on normal SMS charge. There is no special charge for tweeting.
Airtel is the largest mobile operator in India.
Send START to 53000 and start tweeting.
According to today' news (Oct 16, 2009), Airtel will charge Rs 1 for each SMS. Airtel named it service for twitter as TweetSMS.
Very clever idea of Airtel in this deal is that after mobile portability, which will come very soon in India, Airtel subscriber can grow due to exclusive right of tweeting from Airtel mobile in India.