The Department of Telecommunications (DoT) has set 31 December 2026 as the compliance deadline for messaging platforms to implement SIM-binding requirements, with the rules set to take effect from 1 January 2027. Under the new framework, apps like WhatsApp and Telegram — which use Indian mobile numbers for registration — will be required to verify that the registered number is tied to an active SIM card or eSIM present on the device.

What the SIM-Binding Rule Requires

Once in force, the rules will compel messaging platforms to continuously confirm that the phone number used to create an account is linked to an active SIM or eSIM on the same device. Users who remove, replace, or deactivate the registered SIM card could find their app access suspended until the same number is restored through a valid SIM or eSIM profile.

Crucially, the proposed restrictions are tied to SIM verification and account authentication — not to device brands or operating systems. Available information does not suggest that WhatsApp or other apps will stop functioning on specific iPhone or Android models from 1 January 2027.

Why the Government Is Introducing This Rule

The DoT has framed the measure as a direct response to the growing menace of cyber fraud, phishing operations, and so-called digital arrest scams. According to the department, fraud networks have routinely purchased Indian SIM cards, registered messaging accounts using those numbers, and then operated those accounts from outside India — often to target Indian consumers financially.

Authorities believe a tighter link between active SIM cards and messaging accounts will significantly raise the cost of such cross-border misuse. The government has also cited large financial losses suffered by Indian consumers in recent years as a key reason for tightening regulations, though specific figures have not been officially quantified in publicly available statements.

Which Apps Are Covered — and Which Are Not

WhatsApp and Telegram are among the platforms expected to fall within the scope of the mandate, given their reliance on phone numbers for user identification. However, reports indicate Snapchat is not expected to be covered by the SIM-binding requirement.

The status of Signal remains unclear. Reports suggest the platform had not responded to government communications when the matter was reviewed, leaving its compliance position unresolved ahead of the deadline.

Who Will Be Most Affected

The changes are likely to have the greatest impact on three groups of users: those who keep the registered SIM in a secondary handset while using WhatsApp or Telegram on another device; those who remove the SIM after completing initial account setup; and those who rely predominantly on Wi-Fi and rarely use cellular services.

Users with dual-SIM devices will need to ensure the number linked to their messaging account remains active. The rules are expected to apply equally to physical SIM cards and eSIM profiles — users with an active eSIM registered to the account number are unlikely to face disruption solely because they do not carry a physical SIM.

What Users Should Do Before January 2027

With the compliance deadline roughly two months away, users are advised to confirm that the mobile number registered to their messaging accounts corresponds to an active SIM or eSIM on their primary device. Platforms themselves are expected to issue guidance closer to the enforcement date, though no major app has issued a formal public statement on implementation specifics as of 23 October 2026.

How strictly the rules are enforced — and whether grace periods or appeals mechanisms are built in — will depend on the final compliance framework that platforms submit to the DoT by 31 December 2026.