Idea cellular was the biggest gainer adding 2.45 mn users into its kitty followed by Airtel with 2.41 mn additions.
Indian GSM telecom operators added 11.1 million subscribers to their kitty in April, according to the Cellular Operators' Association of India (COAI).
However, the figure is lower than the March figure, when 14.49 million subscribers were added by the operators. With this, the total GSM subscriber base in the country has now climbed to 580.66 million.
