If you use WhatsApp or Telegram on a phone that does not carry the SIM linked to your account, a change is coming. The Department of Telecommunications (DoT) has set December 31, 2026 as the compliance deadline for messaging platforms to bind Indian user accounts to an active SIM card in the device, with the requirement expected to take effect from January 1, 2027. The government says the move is aimed at shutting down cyber fraud, phishing and "digital arrest" scams run through accounts registered on Indian numbers but operated from elsewhere.
For most people who keep their SIM in the same phone they chat on, very little will change. But dual-phone users, people on Wi-Fi-only tablets and heavy WhatsApp Web users may notice the difference.
What is SIM binding?
SIM binding means an app checks that the mobile number you registered with is actually present and active in the device – as a physical SIM or an eSIM. Today, you can verify WhatsApp with an OTP once, take the SIM out, and the account keeps working. Under the new rules, if the registered SIM is removed, deactivated or swapped, the app may pause its features until the same number is active on the device again.
Banking and UPI apps already work this way, which is why they ask you to pick a SIM slot during setup. The DoT wants messaging and calling apps that use Indian mobile numbers as identifiers to follow a similar model.
| Rule | Messaging accounts must be linked to an active SIM/eSIM in the device |
| Issued by | Department of Telecommunications (DoT) |
| Compliance deadline | December 31, 2026 |
| Expected start | January 1, 2027 |
| Apps expected to be covered | WhatsApp, Telegram and other OTT messaging apps using Indian numbers |
| Web/desktop sessions | Risk-based logouts instead of a fixed six-hour logout |
| Stated aim | Curb cyber fraud, phishing and digital arrest scams |
What changed from the original plan
The DoT's original directions, issued in late 2025, had proposed that web and desktop versions of these apps log users out every six hours. That requirement has now been replaced with risk-based logouts, meaning platforms can end sessions when activity looks suspicious and cut off service immediately in suspected fraud cases. The deadline itself was pushed back after companies flagged technical difficulties in building the system.
Reports differ on exactly which smaller apps will fall under the rule, and the DoT has not published a final list, so users of other platforms should watch for in-app notices.
Who will feel the change most
- Two-phone users: If your SIM sits in a basic phone while WhatsApp runs on a smartphone without it, the account may stop working.
- Tablet and Wi-Fi-only devices: Devices without a cellular connection may face restrictions as primary devices.
- Linked devices: WhatsApp Web and desktop users may be asked to reconnect more often.
- Travellers: People who swap their Indian SIM for a local one abroad should check how their app behaves before they fly.
- Dual-SIM and eSIM users: You are fine as long as the number registered on the app stays active on the phone.
What you can do now
There is no need to panic or switch apps. A few simple steps will keep you on the right side of the rule:
- Make sure the number linked to WhatsApp or Telegram is the one physically in your phone or active as an eSIM.
- Keep that number recharged and active – a deactivated number is the most common way to lose access.
- Back up your chats in case you need to re-verify.
- Treat any message asking you to "update KYC for WhatsApp" or share an OTP as a scam; the apps will notify you inside the app itself.
Why the government is pushing this
Investigators have repeatedly found that fraud calls and messages, including digital arrest scams in which victims are threatened by people posing as police or officials, are run from accounts registered with Indian numbers whose SIMs are no longer in India. Tying the account to an active SIM makes it harder to run such accounts from abroad and easier to trace misuse back to a verified KYC holder.
What happens next
Platforms have until December 31 to roll out the technical changes. Expect apps to start showing prompts in the coming weeks asking users to confirm their SIM or re-link devices. The DoT may also issue clarifications on exempt apps and on how verification will work for eSIMs and international roaming.
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