India SIM linking rule is set to bring a major shift in how millions of people use WhatsApp, Telegram, Signal, and other messaging platforms. Under the new Telecommunication Cybersecurity Amendment Rules, 2025, the government has instructed messaging apps to ensure users can only access their accounts if they have an active SIM card on their device. This marks the first time India is bringing app-based communication platforms under telecom-style compliance.
Messaging Apps Must Enforce Continuous SIM Link
The Department of Telecommunications has formally classified these services as Telecommunication Identifier User Entities, or TIUEs. With this change, all messaging apps must begin enforcing continuous SIM linkage within 90 days. This means users will no longer be able to access WhatsApp or similar platforms if they remove or deactivate their SIM cards.
Additionally, for users accessing these apps from a computer, the way login sessions work will change dramatically. Web sessions must now automatically log out every six hours. To keep using the service, users will need to scan a QR code again, ensuring active SIM authentication at all times. According to the government, this rule will make it harder for cybercriminals to operate accounts remotely.
What’s Driving This Policy?
The DoT believes that a major security loophole exists in the current system. Most messaging apps verify a mobile number only during the initial registration. After that, the service continues to work even if the SIM card is no longer active. This makes it difficult for authorities to trace suspicious activity because the device, user identity, and phone number are not consistently linked.

Industry groups such as the Cellular Operators Association of India support the change. They argue that persistent SIM binding ensures stronger traceability, discourages fraud, and reduces spam. Moreover, similar rules already govern digital banking apps and UPI platforms, which require constant SIM authentication for security reasons.
Experts Raise Concerns About Practical Impact
Despite potential security benefits, several cybersecurity analysts question how effective the new rule will be. They argue that scammers can simply buy new SIM cards using forged or borrowed IDs. As a result, they fear that fraud might continue even if legitimate users face more inconvenience. Many users also worry about losing the convenience of staying logged in on WhatsApp Web or similar services.
Telecom experts, however, insist that mobile numbers remain India’s strongest form of digital identity. They believe that even if the rule does not solve every problem, it will still increase accountability and reduce misuse of messaging platforms.
As India prepares for the rollout, the biggest challenge for messaging apps will be implementing these rules without compromising user experience, privacy, and accessibility.

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