NEW DELHI, Dec 23 - Tata Teleservices [TATASL.UL], India's sixth-largest mobile operator, said it signed 3.3 million users in November, leading industry additions for the fourth straight month and taking its customer base to 54 million.

Tata Tele, in which Japan's NTT DoCoMo (9437.T) owns a 26 percent stake, was the first mobile operator to introduce per-second billing and unlimited calls for a fixed price, which has helped it add about 15 million users in the last four months.

Top mobile operator Bharti Airtel (BRTI.BO) added 2.8 million mobile users in November to have a total of 116 million. (Reporting by Devidutta Tripathy; Editing by John Mair)

Japan India Bharti Airtel