MUMBAI | Mobile service is returning to Mumbai Metro’s underground Aqua Line after a prolonged dispute over shared telecom infrastructure left passengers without dependable calls, data and digital payments across much of the corridor. Vodafone Idea says its network is now live across 16 stations from Aarey JVLR to Acharya Atre Chowk, and Airtel has begun activating service. Work on the remaining stretch toward Cuffe Parade is continuing. The improvement is practical, but it also exposes how a modern transport project opened without resolving an essential communications system.
Underground rail requires specialized in-building infrastructure because ordinary surface towers cannot reliably reach tunnels and deep stations. Antennas, fiber, amplifiers and radio equipment must be installed in constrained spaces and shared among operators. Mumbai Metro Rail Corporation Limited chose a neutral-host approach intended to avoid duplicating equipment, but telecom companies disputed commercial terms and control of the system.
The conflict lasted through several phases of the Aqua Line’s opening. At times, passengers could find limited signal at individual stations or use Wi-Fi near ticketing areas, but continuous service was unavailable. That affected more than entertainment. Riders rely on phones for UPI payments, app-based tickets, navigation, work messages and contact during delays or emergencies.
Economic Times reporting said Reliance Jio, Bharti Airtel and Vodafone Idea resolved differences with MMRCL over installation of the infrastructure. Moneycontrol reported that Vi confirmed live service at 16 stations and that a second phase covering 11 stations from Science Centre toward Cuffe Parade is underway. Carrier coverage may not be identical during the rollout, so passengers should expect gaps until each operator confirms completion.
The dispute shows why telecom should be treated as core railway infrastructure rather than an optional concession. Tunnels need dedicated emergency radio systems for staff and responders, while public mobile coverage provides additional resilience. A passenger who witnesses a medical emergency or safety threat should not have to wait for the train to reach the surface before seeking help.
Digital ticketing makes connectivity even more important. A transport system can encourage cashless travel while creating difficulty if tickets, wallets or bank authentication fail underground. Offline ticket storage and station Wi-Fi can reduce the risk, but they should be backups rather than permanent substitutes for reliable network service.
The neutral-host model remains logical because space in tunnels is limited and three separate systems would increase cost and complexity. Its success depends on transparent pricing and technical rules accepted before passenger service begins. MMRCL and the operators should publish the governance arrangement so future disputes can be resolved without abruptly disconnecting riders.
Commercial confidentiality does not justify silence about service standards. Passengers need to know which stations and tunnels have coverage, which carriers are active and when remaining sections will be completed. A live coverage map would be more useful than broad announcements that the problem is solved.
The rollout should also be tested for capacity, not merely the presence of a signal. A network that works on an empty platform may fail when thousands of riders arrive during the morning peak. Operators should measure call completion, data performance and handoffs between stations under real passenger loads. Results can identify weak areas before an emergency exposes them.
Cybersecurity and physical security require coordination. Shared infrastructure can create efficiency, but access must be controlled and equipment protected from tampering. Operators and the metro corporation need clear responsibility for software updates, incident response and maintenance. A fault in a common system can affect several carriers at once.
Power resilience matters as well. Telecom equipment should remain available during a grid failure long enough to support evacuation and emergency communication. Backup duration, battery maintenance and generator connections should be part of railway safety planning. Mobile coverage that disappears precisely when the transport system is disrupted provides limited protection.
The experience offers a lesson for other Indian metros. Underground projects should finalize telecom design, commercial agreements and installation schedules during construction, not after trains begin running. Opening a line without mobile service may meet a rail deadline while transferring the unresolved problem to passengers.
The companies also need a fair process for cost recovery. Operators will not invest indefinitely in infrastructure they consider uneconomic, while a public metro cannot allow a commercial disagreement to compromise basic passenger service. Independent arbitration or regulatory guidance could prevent a future standoff from lasting years.
Passengers will judge the announcement through everyday use. Calls should continue between stations, digital payments should work and coverage should extend through the full corridor. Complaints should be collected by station and carrier so technical teams can distinguish a local dead zone from a network-wide failure.
The return of service is a meaningful improvement for one of Mumbai’s most important infrastructure projects. It should also end the assumption that connectivity can be negotiated after opening. A 21st-century underground railway includes tracks, ventilation, signaling, emergency systems and communications. Each must be ready if the system is to deliver the safety and convenience promised to the public.
Emergency services should test whether public networks remain usable during a train evacuation or major incident when thousands of devices connect simultaneously. Dedicated railway radio remains primary for staff, but passenger networks can carry calls, alerts and location information. Capacity planning should include abnormal demand, not only routine commuting.
The rollout can support accessibility features such as real-time captions, navigation and assistance apps used by passengers with disabilities. Loss of connectivity can remove tools that make independent travel possible. Service standards should therefore recognize mobile data as part of accessible transport.
Station Wi-Fi should remain available as a secondary option and use secure authentication. Public networks can expose riders to fraud or data interception if they are poorly configured. MMRCL should state who operates Wi-Fi, what information is collected and how long logs are retained.
The commercial settlement should include a rapid dispute mechanism so future disagreements do not result in service suspension. Operators can contest fees without using passengers as leverage. A regulator or neutral arbitrator could impose temporary operating terms while a dispute is heard.
Full restoration will also require clear handoffs among 4G and 5G systems and between underground and surface coverage. Riders should not lose a call at every station boundary. Technical acceptance tests should reflect continuous journeys rather than isolated signal readings.
Passenger feedback should be integrated into technical acceptance. Riders can report tunnel segments where calls drop or payment apps fail, and operators can publish repair status. Crowdsourced reports are not a substitute for engineering tests, but they reveal the difference between laboratory coverage and everyday experience.
The restored network may also improve operational communication during ordinary delays. Passengers can notify families, change routes and receive official updates without waiting to reach a station exit. That reduces confusion and pressure on station staff.
Aqua Line connectivity should be treated as a service with measurable uptime. MMRCL and carriers can publish targets, outage reporting and restoration times. A vague promise of availability offers little accountability when service disappears again.
Reliable service should remain the standard after the launch publicity ends.
Permanently.
Additional Reporting By: Nisha Rao, CGN Mumbai Local Reporter, Meera Iyer, CGN Mumbai Technology Reporter and Farah Khan, CGN Mumbai Investigations Reporter; Economic Times; Moneycontrol; Mint; Times of India