The Cellular Operators Association of India (COAI), representing India’s leading telecom service providers – Bharti Airtel, Reliance Jio and Vodafone Idea – has strongly opposed Mumbai Metro Rail Corporation (MMRC)'s policies on telecom infrastructure on Metro Line-3 (Colaba–Bandra–Aarey corridor).

At the core of this issue is MMRC's decision to award the telecom infrastructure deployment to a third-party Infrastructure Provider-Category-I vendor, which the COAI says is in violation of existing regulations.