The way you use WhatsApp is set to change from January 1; the app will not work if the SIM card is not in the phone.

Starting January 1, 2027, a 'SIM binding' rule will come into effect for apps like WhatsApp and Telegram. Find out how this will impact those who use WhatsApp without a SIM card, and what it means for eSIM users, iPhone owners, and those using WhatsApp Web.

If you use WhatsApp or Telegram on a phone that does not contain the SIM card originally used to create the account, take note: the government’s SIM binding rule will take effect on January 1, 2027. Moving forward, these apps will only function if the phone contains the active SIM card associated with the account. If the SIM is removed, deactivated, or changed, the app may stop working.

What exactly is 'SIM binding'?

Simply put, SIM binding links your WhatsApp account to your specific SIM card. Previously, once a phone number was verified via an OTP, the app would continue to work even if the SIM card was removed. Many people used WhatsApp on older phones connected only via Wi-Fi; this will no longer be possible under the new rules.

The app will periodically verify whether the SIM card is present in the device. If it is not detected, the app may cease to function. The good news is that your existing chats will not be deleted; the app will resume working once the SIM card is reinserted.

Why is the government introducing this rule?

The Department of Telecommunications (DoT) states that fraudsters have been exploiting this loophole. They would verify an Indian phone number once and then, while operating from abroad, use that same account to scam people.

Accounts remained active even after the SIM card was removed or deactivated. This tactic was frequently observed in scams such as 'digital arrests' or instances where fraudsters posed as government officials. With SIM binding, every account will be linked to a KYC-verified SIM card, making it easier to track down fraudsters.

Which apps will this apply to?

WhatsApp, Telegram, and Signal fall under the scope of this rule. The government had initially sent notices to Snapchat, ShareChat, JioChat, Josh, and Arattai as well; however, it is now reported that Snapchat has been granted an exemption from this rule. Meanwhile, Signal has yet to respond to the government's notice.

What about those using an eSIM?

Many modern phones do not use a physical plastic SIM card; instead, they utilize an eSIM, which is integrated digitally within the device. Users may wonder if their WhatsApp service will be interrupted. According to reports, this will not be the case. If an eSIM is active on a phone, it is considered a valid SIM, and WhatsApp will continue to function. It should be noted, however, that the government did not explicitly mention eSIMs in its statement.

Users with an eSIM should keep one thing in mind: unlike a physical SIM card, which can simply be removed and inserted into another device, an eSIM must be transferred to a new phone through the telecom provider. Consequently, if you switch to a new phone, WhatsApp may not work until the eSIM has been successfully activated on that device.

On the other hand, an eSIM can be quite advantageous for those traveling abroad. You can insert a local SIM card for data access while keeping your Indian eSIM active on the same device.

What about iPhone users?

Implementing this rule on iPhones was considered the most challenging aspect. According to sources, Apple has made the necessary adjustments to its iOS. A software update released in September now enables iPhones to detect whether a SIM card is present. Apple, however, has not yet made an official statement regarding this. Meanwhile, WhatsApp has already begun testing this on Android devices.

A relief for WhatsApp Web users

Previously, the rule stipulated that WhatsApp Web—the version used on computers—would automatically log out every six hours, which posed a significant inconvenience for those using it in an office environment. The government has now removed this requirement. A logout will now only occur if there is a suspicion of fraudulent activity associated with an account.

Deadline Postponed Multiple Times

The Department of Telecommunications (DoT) issued this directive on November 28, 2025, granting companies a 90-day window for compliance. This meant the requirements were initially set to be met by February 2026; however, the companies—along with Apple—cited technical challenges and requested more time. Consequently, the deadline was extended to December 31, 2026. The regulations will now come into effect on January 1, 2027. Apps that fail to comply may face action under the Telecommunications Act, 2023.

What Should You Do?

If you use two phones and run WhatsApp on a device that does not contain a SIM card, you should prepare accordingly. Ensure that the SIM card associated with your WhatsApp account is placed in the same device you use to access the app. Additionally, keep your SIM active and ensure your mobile plan remains recharged, as an inactive SIM could cause the app to stop functioning. If you use an eSIM, make arrangements to transfer it before switching devices. If you are traveling abroad, ensure that your Indian SIM card remains active.

Divergent Views

While the government views this as a significant measure to curb fraud—a stance supported by telecom companies—industry bodies like the Broadband India Forum argue that these regulations exceed the authority granted by existing law. Furthermore, a survey indicated that many individuals and small business owners believe these rules could disrupt their daily operations.