Idea Cellular is an Indian mobile network operator based in Mumbai, Maharashtra. Idea is a pan-India integrated GSM operator offering 2G, 3G and 4G mobile services. Idea Cellular ( commonly referred to as simply Idea, and stylised as ! dea) is an Indian mobile network operator based in Mumbai, Maharashtra. Idea is a pan-India integrated GSM operator offering 2G, 3G and 4G mobile services. Idea is India’s third largest mobile operator by subscriber base, After Vodafone India. Idea has 182 million subscribers as of 31 December 2015. [3]