SIM binding
Why in news?
- India's Department of Telecommunications (DoT) mandated SIM binding for messaging platforms like WhatsApp, Telegram, Signal, Snapchat, and others on November 29, 2025.
- Platforms must enforce continuous SIM linkage within 90 days, blocking access if the SIM is absent, under the Telecommunication Cybersecurity Amendment Rules, 2025.
- Web versions, such as WhatsApp Web, require logout every six hours, with compliance reports due in four months.​
About SIM binding
- SIM binding links a user's mobile device and app account to the specific SIM card used for registration, ensuring continuous verification of the SIM's presence for access.
- This security measure prevents unauthorized use by requiring the original SIM to remain in the device.
- It acts as hardware-based authentication, reducing risks from SIM swaps or removals.​
Purpose and Benefits
- The directive targets cyber frauds, spam, and scams originating outside India, where apps currently function post-initial verification even without the SIM.
- Telecom groups like COAI support it for better traceability via Telecommunication Identifier User Entity (TIUE) rules.
- Benefits include passwordless authentication, real-time fraud detection, and cross-platform security without extra hardware.​
Implications for Users
- Users traveling abroad, using multiple devices, or relying on eSIMs/Wi-Fi-only access may face disruptions, as apps stop working without the physical SIM.
- Those using web apps for reduced phone time during work will need frequent re-authentication via QR scans.
- While aimed at security, critics note limited scam prevention if fraudsters use forged IDs.​
