India’s Department of Telecommunications (DoT) has introduced a shift in the way messaging platforms operate in the country, mandating the adoption of SIM-binding as a core security requirement. Under the Telecommunication Cybersecurity Amendment Rules, 2025, all major messaging services, including Telegram, and regional platforms such as Arattai, must ensure that their applications remain continuously linked to an active SIM card on the user’s device.   The mandate is part of the government’s intensified efforts to combat cyber fraud and strengthen nationwide cybersecurity compliance. The directive requires App-Based Communication Service providers to implement persistent SIM-linking within 90 days and submit detailed cybersecurity compliance reports within 120 days. The move seeks to eliminate longstanding gaps in identity verification systems that have enabled malicious actors to misuse Indian mobile numbers from outside the country. 

New Rules for SIM-Binding Communication 

According to the new requirements, messaging services must operate only when the user’s active SIM card matches the credentials stored by the app. If a SIM card is removed, replaced, or deactivated, the corresponding app session must immediately cease to function. The rules also extend to web-based interfaces: platforms must automatically log users out at least every six hours, requiring a QR-based reauthentication that is tied to the same active SIM.  These changes aim to reduce the misuse of Indian telecom identifiers, which authorities say have been exploited for spoofing, impersonation, and other forms of cyber fraud. By enforcing strict SIM-binding, the DoT intends to establish a clearer traceability chain between the user, their device, and their telecom credentials. 

Why Stricter Controls Were Needed 

Government observations revealed that many communication apps continued functioning even after the linked SIM card was removed. This allowed foreign-based actors to operate accounts associated with Indian mobile numbers without proper authentication. The ability to hijack accounts or mask locations contributed directly to an uptick in cybercrimes, often involving financial scams or identity theft.  Industry groups had previously flagged this vulnerability as well. The Cellular Operators Association of India (COAI), for instance, noted that authentication typically occurs only once, during initial setup, which leaves apps operational even if the SIM is no longer present. By requiring ongoing SIM-binding, authorities aim to close this loophole and establish reliable verification pathways essential for cybersecurity compliance.  The new mandate draws support from multiple regulatory frameworks, including the Telecommunications Act, 2023, and subsequent cybersecurity rules issued in 2024 and 2025. Platforms that fail to comply could face penalties, service restrictions, or other legal consequences under India’s telecom and cybersecurity laws. 

Impact on Platforms and Users 

Messaging platforms must redesign parts of their infrastructure to support real-time SIM authentication and implement secure logout mechanisms for multi-device access. They are also expected to maintain detailed logs and participate in audits to demonstrate cybersecurity compliance.  For users, the changes may introduce constraints. Accessing a messaging app without the original active SIM will no longer be possible. Cross-device flexibility, particularly through desktop or browser-based interfaces, may also be reduced due to the six-hour logout requirement. However, policymakers argue that these inconveniences are offset by a reduced risk of cyber fraud.  India’s focus on SIM-binding aligns with practices already common in financial services. Banking and UPI applications, for example, require an active SIM for verification to minimize fraud. Other regulators have taken similar steps: earlier in 2025, the Securities and Exchange Board of India (SEBI) proposed linking trading accounts to specific SIM cards and incorporating biometric checks to prevent unauthorized transactions. 

India Mandates Pre-Installed Cybersecurity App on Smartphones

In a parallel move to strengthen digital security, India’s telecom ministry has ordered all major smartphone manufacturers, including Apple, Samsung, Vivo, Oppo, and Xiaomi, to pre-install its cybersecurity app Sanchar Saathi on all new devices within 90 days, and push it via updates to existing devices. The app must be installed in a way that users cannot disable or delete it. Launched in January, Sanchar Saathi has already helped recover over 700,000 lost phones, blocked 3.7 million stolen devices, terminated 30 million fraudulent connections, and assists in tracking devices and preventing counterfeit phones. The app verifies IMEI numbers, blocks stolen devices, and combats scams involving duplicate or spoofed IMEIs. The move is aimed at strengthening India’s telecom cybersecurity but may face resistance from Apple and privacy advocates, as Apple traditionally opposes pre-installation of government or third-party apps. Industry officials have expressed concerns over privacy, user choice, and operational feasibility, while the government emphasizes the app’s role in digital safety and fraud prevention.