Idea cellular commonly refered to idea is an indian mobile network operator based in mumbai india .Idea is a pan india integrated GSM operator offering 2g, 3g and 4g mobile service During its inception in 1995 Aditya Birla Group, Tata Group and AT& T wireless each held one third equity in the company .Following AT& T wireless merger with cingular wireless in 2004, cingular decided to sell its 32.9% stake in india.