Mobile connectivity on Mumbai Metro Line Three ceased after the termination of a telecom contract that provided in-station and in-tunnel coverage. The metro operator reported that the contract end led to an immediate halt in cellular and data services across the corridor, affecting all telecom carriers that had relied on the agreement. Commuters were left without reliable voice or internet access while travelling, and station staff had to revert to standard public address systems to share information. The termination removed equipment maintenance and spectrum access arrangements that sustained the distributed antenna system and neutral host solution inside tunnels and concourses. Transport authorities highlighted that such infrastructure depends on continuing agreements between the transit operator and service providers, and that abrupt cessation can disrupt passenger communications and operational monitoring. The loss also affected the ability to use mobile-based ticketing and journey apps, increasing reliance on ticket counters and offline procedures. City regulators and the metro authority moved to engage telecom firms and legal advisers to seek rapid reinstatement or replacement of services, prioritising passenger safety and minimal disruption. Engineers began assessing the scope of work required to restore coverage, including recommissioning of antennas, backhaul connectivity and power supply systems, and negotiating access for equipment vendors. Officials expected that restoring full service would require co-ordination with multiple stakeholders and adherence to safety and technical standards. The incident is likely to prompt reviews of contract terms and contingency planning across urban transit networks to reduce vulnerabilities from single supplier dependence. Commuter groups urged transparent timelines for recovery and regular updates on interim arrangements, while authorities considered short term mitigations such as temporary Wi-Fi hotspots and enhanced on-ground communication protocols. The episode underscored the growing reliance of modern metro systems on resilient digital infrastructure and the need for robust contractual safeguards.