India has surpassed China as the biggest engine of global 5G growth, by dint of its large scale and stage of deployment. Now with rate of roll out already showing signs of slowing down, its major operators are intensifying calls for more spectrum to meet proliferating demand for services. A call has come from the Cellular Operators Association of India (COAI), which represents the operators, which have now come down to the big three of Reliance Jio Infocomm, Bharti Airtel, and Vodafone Idea. It is almost two and a half, since Vodafone Idea has been struggling to keep pace after sustained financial difficulties – culminating in the government taking a 33% stake in exchange for paying off $1.95 billion debt…