Total subscriber base at the end of November 2011 stood at 663.78 million users.
The top three operators -- Bharti Airtel, Vodafone and Idea Cellular -- which account for over 67 per cent of the GSM market lost over 5 million users in December, data released by Cellular Operators Association of India said.
Except Uninor, which added 9,18,552 users, not even a single operator added any new subscriber during December last year.
Bharti Airtel, which is the industry leader with a 27.68 per cent market share, lost 1.70 million users to take its subscriber base to 181.91
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