Indian government makes SIM card link mandatory for WhatsApp, Telegram. Here's why

The government has ordered that messaging platforms such as WhatsApp, Telegram, Signal and other popular apps will no longer work on a device if the registered SIM card is not actively inserted.

Under the new directive from the Department of Telecommunications (DoT), all messaging services classified as “Telecommunication Identifier User Entities” (TIUEs) must ensure continuous linkage between the user’s mobile number and the active SIM card registered with that number. This means that if the SIM card is removed or deactivated, the apps will cease functioning on that device.

In addition, web or desktop versions of these apps—such as WhatsApp Web—must now enforce automatic logout at least once every six hours, requiring users to re-authenticate using a QR code.

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The rule took effect immediately following the government’s 28 November notification. TIUEs are given a 90-day window to fully implement the SIM-binding requirement. Compliance reports must be submitted within 120 days; failure to comply may result in actions under the Telecommunications Act, 2023 and the Telecom Cyber Security Rules, 2024.

Why the change?

According to DoT officials, certain messaging platforms previously allowed users to continue using their services even after the registered SIM was removed or replaced, a loophole that has been exploited for cyber-fraud and digital impersonation, including scams originating from outside India.

The new SIM-binding rule aims to restore a reliable link between a device and the registered mobile number, making it easier to trace and curb misuse.

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What it means for users

For everyday messaging users, the changes may mean reduced flexibility: switching devices, using secondary phones, using Wi-Fi-only tablets, or accessing the apps on multiple gadgets could become more cumbersome. Users of web-based versions will need to re-link devices frequently, and using the apps without the original SIM card will no longer be possible.

While supporters of the directive argue it strengthens cybersecurity and helps prevent fraud, critics—including some industry players—suggest the mandate could be disruptive, especially for users who travel abroad, use dual-SIM phones or rely on e-SIMs or shared devices.