SIM Binding for Messaging Apps: Why WhatsApp and Telegram Will Need an Active SIM From January 1
The Department of Telecommunications (DoT) has issued guidelines that from January 1, messaging apps such as WhatsApp and Telegram will not work on a phone that does not have the active SIM card linked to the account. This rule is called SIM binding.
The DoT first gave these directions on November 28, 2025, to apps including WhatsApp, Telegram, Signal, Snapchat, ShareChat, JioChat, Josh and Arattai. The original deadline was pushed to December 31, 2026, after app companies said they needed more time to build it on both Android and Apple phones.
The aim is to stop cross-border cyber fraud, phishing and "digital arrest" scams, in which criminals sitting abroad use Indian mobile numbers on apps even though the SIM is no longer in India.
Apple has released an iOS software update that helps detect when an iPhone is running without a physical SIM card, so that apps can follow the rule.
Signal is reported not to have responded yet to the government's notices.
The legal basis is the Telecommunications (Telecom Cyber Security) Rules, 2024, as amended in October 2025, which brought apps that use mobile numbers to identify users under the DoT's cyber security rules.
Telecom Cyber Security Rules, 2024: SIM Binding and Mobile Number Checks
The Telecommunications (Telecom Cyber Security) Rules, 2024 are a set of rules that tell telecom companies, and now also apps that use your mobile number, how to keep India's telecom networks safe from cyber attacks and fraud. They were made by the central government under the Telecommunications Act, 2023. In simple words, these rules are the "safety code" for anything in India that runs on mobile numbers, SIM cards and phone networks. SIM binding for messaging apps comes from these rules.
The rule that WhatsApp and Telegram will need the registered SIM in the phone from January 1 is SIM binding, issued under the Telecom Cyber Security Rules after the 2025 amendment brought such apps under them as TIUEs. Apple's iOS update and the app changes are steps to comply with these rules.
Digital Arrest Scam: A Growing Cybercrime Threat
A "digital arrest" scam is a type of online cheating in which criminals pretend to be police, CBI, customs, Enforcement Directorate (ED) officers or even judges. They call the victim on a video call and say the victim is involved in a crime, such as a parcel with drugs or money laundering. They then keep the victim "under arrest" on camera for hours or days and frighten them into transferring money to "clear their name". There is no such thing as a digital arrest in Indian law. No real agency arrests anyone over a video call.
Digital arrest scams are one of the main reasons the government gave for SIM binding. Many of these scams are run from abroad using WhatsApp or Skype accounts linked to Indian numbers whose SIMs are no longer in India. If an app stops working when the SIM is not in the phone, it becomes much harder for such gangs to use Indian numbers from outside the country.
Telecommunications Act, 2023: From Licensing to Authorisation
The Telecommunications Act, 2023 is India's main law for telecom services like mobile, internet and satellite communication. It replaced the Indian Telegraph Act, 1885 and the Indian Wireless Telegraphy Act, 1933. It decides who can provide telecom services, how spectrum is given, and how users and networks are protected.
The SIM binding guidelines rest on rules made under Section 22 of this Act. Whether rules under a telecom law can bind internet apps is the main legal question raised by the industry.
- SIM binding to apply to messaging apps from January 1, 2027 (deadline extended to December 31, 2026)
- Original DoT direction: November 28, 2025; apps named include WhatsApp, Telegram, Signal, Snapchat, ShareChat, JioChat, Josh, Arattai
- Web/desktop logout: originally every 6 hours; reportedly softened to a risk-based approach
- Telecom Cyber Security Rules notified November 21, 2024; Amendment Rules October 22, 2025
- TIUE = Telecommunication Identifier User Entity; MNV = Mobile Number Validation platform
- Digital arrest losses in 2024: ₹1,935.51 crore across 1,23,672 cases
- Cyber fraud helpline: 1930