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What is SIM Binding?

Nov. 30, 2025

The Department of Telecommunications recently directed Over The Top (OTT) communication apps, such as WhatsApp, Telegram, Snapchat, Signal, Arattai and others, to ensure SIM binding.

About SIM Binding:

  • SIM binding refers to a form of device binding in which a user's mobile device is securely linked to their SIM card.
  • This approach enhances security by ensuring that authentication processes are tied not just to the device but specifically to the unique identity of the SIM card, reducing the risk of unauthorised access.
  • This prevents the user from hackers, spammers, and fraudsters to misuse numbers.

Recent Government Directions:

  • The Department of Telecommunications (DoT) has asked all over-the-top communication platforms operating in India to complete the SIM-binding-to-device exercise within the next 90 days.
  • The DoT has directed these apps to make sure their services work only when the correct SIM card is in the phone.
  • If the app stops working the moment the SIM is removed, the government believes it will close one loophole that scammers use to stay untraceable.
  • Several financial applications, including banking and Unified Payment Interface (UPI) apps, already enforce strict active-SIM rules to prevent fraud.

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