WhatsApp, Telegram SIM-Binding Mandate To Take Effect From January 1: Report

SIM binding means a covered messaging service must remain linked to the active SIM associated with the user’s registered mobile number. The account would not rely only on a phone-number check completed when it was first created. The aim is to keep the connection between the account, number, and SIM ongoing.

For example, an app could verify a number during registration, but later continue working on a phone that no longer contains the associated SIM. Under SIM binding, the service must keep checking that the linked active SIM remains present or otherwise connected as required by its implementation. The article says this is meant to stop misuse of Indian mobile numbers.

The DoT introduced the measure under the Telecom Cyber Security Rules, 2024. It said some services still worked without the registered SIM in the device, allowing possible misuse by fraudsters outside India. The rules are intended to improve traceability and curb phishing, digital-arrest, impersonation, and investment scams.

The original DoT directions covered WhatsApp, Telegram, Signal, Snapchat, Arattai, ShareChat, Josh, and JioChat. The requirement is part of directions issued under the Telecom Cyber Security Rules, 2024. The government later specified December 31, 2026, as the deadline for platforms to complete SIM-binding compliance.

The reported operational start date is January 1, 2027. The original directions had given platforms 90 days to implement the measures and 120 days to submit compliance reports. This later deadline creates a longer timetable for the final implementation push. Apple has also updated its iOS software to support the requirements, according to a CNBC report.

Readiness varies across services. WhatsApp and Arattai confirmed they are working to comply. Telegram had not clarified its status, while Signal had not responded to government notices. Snapchat reportedly argued that the mandate does not apply because it does not use phone numbers to identify users.

People using WhatsApp or Telegram on a phone without the SIM linked to their registered number could face disrupted access. The article does not state one uniform outcome for every user. Instead, it says the mandate could affect people who use messaging apps over Wi-Fi on devices without their registered SIM.

For example, someone might register an account with an Indian mobile number, remove that SIM, and continue using the app on a Wi-Fi-only phone. SIM binding would require the service to remain continuously linked to the active associated SIM, rather than relying only on the original verification. CNBC reported that WhatsApp and Telegram would require a physical SIM card to function.

The precise user experience will depend on each platform’s implementation. International roaming is not expected to be affected if the associated SIM remains in the handset. Access across multiple devices may also change, but the article does not specify a single rule for every device arrangement.

eSIM users may face unclear requirements because the article does not explain how platforms will support them. CNBC reported that WhatsApp and Telegram would require a physical SIM card to function, but the precise treatment of eSIMs remains unsettled. That creates uncertainty for people whose active mobile connection is embedded digitally.

People who frequently switch SIMs could experience interruptions or repeated checks if the app must stay linked to the currently associated active SIM. A user might also find that an account works differently on a second phone, tablet, or Wi-Fi device. The core mechanism is continuous linkage, not merely a number verification during registration.

The impact across multiple devices will depend on individual platform implementations. The article does not establish whether every secondary device will be blocked or how account access will be transferred. International roaming remains unaffected when the associated SIM stays in the handset, according to the DoT.

The figures show a very large cyber-fraud problem. Data sourced from the home ministry says Indians lost ₹22,495 Cr to cyber fraud in 2025. That followed ₹22,845 Cr in losses during 2024. The small year-to-year decline did not remove the scale of the damage.

The National Human Rights Commission gave a broader six-year figure in June. It said Indians had lost around ₹52,976 Cr to cyber-enabled fraud over that period. Nearly 8% of those losses were linked to digital-arrest scams. These figures cover the wider fraud challenge that the government says it wants to address.

The SIM-binding push is one part of that response. The DoT says continuous linkage could improve traceability and help curb phishing, digital arrest, impersonation, and investment scams. At the India Mobile Congress 2026, Prime Minister Narendra Modi called for cooperation among technology companies, financial institutions, and telecom operators.

The government’s reasoning is that a messaging account should remain tied to the active SIM connected with its registered number. If an account can keep working after that SIM is removed, someone using the number may be harder to connect to the device or active mobile connection. Continuous linkage is intended to strengthen traceability.

For example, the DoT said some app-based communication services continued working without the SIM associated with the registered number present in the device. It said this allowed fraudsters operating from outside India to misuse Indian mobile numbers. Requiring the SIM to remain linked could make that kind of continued access more difficult.

The government says the measure is intended to curb phishing, digital-arrest, impersonation, and investment scams. It is not presented as a complete solution to cyber fraud. Modi also called for technology companies, financial institutions, and telecom operators to build a broader security framework for cyber fraud and deepfakes.

A mobile number is the address associated with a subscriber’s mobile service. A SIM card, including the article’s discussed active associated SIM, connects that service to a device. The phone provides the hardware and network connection used to access the service. A messaging-app account is created using a registered mobile number and then operates through the app on one or more devices.

Normally, the app may verify control of the number when the account is first created. The article describes SIM binding as a stronger ongoing link: the service must remain connected to the active SIM associated with that registered number. This is why access from a phone without the SIM, even over Wi-Fi, could be affected.

The exact authentication steps are not specified in the article and may differ by platform. It also does not explain every relationship between accounts and multiple devices. The DoT’s stated purpose is better traceability and reduced misuse of Indian mobile numbers, not simply initial number verification.