Key Points
- India’s Cell Broadcast System, built by C-DOT, can send geo-targeted alerts to millions simultaneously
- The system integrates with the CAP-based SACHET platform used by disaster management authorities
- CBS was launched by Union minister Jyotiraditya Scindia in collaboration with NDMA and MHA
The government launched the Cell Broadcast System (CBS) on Saturday, a domestically developed public warning technology that can push simultaneous, location-specific emergency alerts to every mobile phone within a defined geographical area, without requiring an internet connection or the recipient’s phone number.
The system was unveiled by Union minister for Communications Jyotiraditya Scindia, at an event in New Delhi jointly organised by the Department of Telecommunications (DoT), the National Disaster Management Authority (NDMA) and the Ministry of Home Affairs (MHA). The technology was built by the Centre for Development of Telematics (C-DOT), a DoT-established research body.
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Cell broadcast is a one-to-many messaging standard built into mobile network infrastructure. Unlike an SMS, which is sent to individual numbers, a cell broadcast message is transmitted by a base station to all compatible handsets simultaneously within its coverage area.
No personal data is required and the message cannot be declined by the recipient the way a call or SMS can. Modern smartphones running Android 11 and above, as well as recent iOS versions, support the standard natively, meaning most devices in active use today can receive these alerts without any app installation.
How the Cell Broadcast System works
India’s CBS is integrated with the SACHET platform, which is built on the Common Alerting Protocol (CAP), an internationally recognised open standard for emergency alerts. CAP is a data format that allows a single alert message to be distributed simultaneously across multiple communication channels, including broadcast radio, television crawls, sirens and mobile networks, using a consistent structure that systems can read and act on automatically.
SACHET serves as the central hub through which government authorities at the national and state level can issue alerts. Once an alert is entered into SACHET, the CBS infrastructure relays it to the relevant mobile network operators, who then broadcast it through their base stations in the affected area. The entire process is designed to take effect within seconds of an alert being triggered.
Scindia, speaking at the launch, said: “The launch of the Cell Broadcast System marks a transformative step in India’s disaster management framework, reflecting our shift from a reactive to a proactive approach in safeguarding citizens.”
“By leveraging advanced telecom technologies, CBS enables near real-time, geo-targeted alerts to reach millions instantly, ensuring that no individual is left behind. This indigenous, globally benchmarked solution strengthens our preparedness, enhances response capabilities, and reinforces our commitment to building a safer, more resilient India,” he added.
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Why cell broadcast matters for disaster response
India is among the world’s most disaster-prone countries. Cyclones along the eastern and western coastlines, floods across river basins in Assam, Bihar and Odisha, earthquakes in the Himalayan belt and industrial emergencies in densely populated urban zones all create recurring scenarios where mass public warning can directly save lives.
The critical gap in existing systems has been the last mile: reaching people who are not watching television, not listening to the radio and not connected to the internet at the moment an emergency unfolds.
Cell broadcast addresses this gap directly. Because it operates through the base station layer of the mobile network rather than through data packets or individual addressing, it functions even when networks are congested, which is typically the case in the immediate aftermath of a disaster when call volumes surge.
Countries including Japan, whose J-Alert system has been operational since 2007, the United States, where Wireless Emergency Alerts are mandated by federal law, and most European Union member states under the EU Electronic Communications Code have demonstrated that cell broadcast can achieve near-universal reach within seconds.
India had approximately 1,170 million wireless subscribers as of early 2025, according to TRAI subscriber data, making the potential reach of a fully operational CBS among the largest of any single national deployment in the world.
The system’s indigenous development by C-DOT also means the technology is not dependent on foreign vendors for its core architecture, a factor that carries significance for critical national infrastructure.
The involvement of MHA alongside DoT and NDMA indicates that the alert trigger authority will sit within the government’s security and emergency management structure rather than with telecom operators alone, consistent with how similar systems are governed internationally.
Your Questions, Answered
What is the Cell Broadcast System launched in India?
The Cell Broadcast System is a public warning technology built by C-DOT that allows government authorities to send simultaneous, geo-targeted emergency alerts to all mobile phones within a defined area. It works through the mobile network’s base station layer and does not require an internet connection or the recipient’s phone number.
Do I need to install an app to receive CBS alerts on my phone?
No. Most modern smartphones, including those running Android 11 and above and recent iPhone models, support cell broadcast natively. Alerts will appear automatically on compatible devices without any app installation required.
What is the SACHET platform and how does it connect to CBS?
SACHET is India’s central emergency alert hub, built on the Common Alerting Protocol (CAP), an international open standard. Government authorities enter alerts into SACHET, which then relays them through the CBS infrastructure to mobile operators, who broadcast the message to phones in the affected zone.
Which government bodies are responsible for triggering CBS alerts?
The system is jointly overseen by the Department of Telecommunications, the National Disaster Management Authority and the Ministry of Home Affairs. The involvement of MHA indicates that alert trigger authority sits within the government’s emergency management and security structure.