India’s Department of Telecommunications (DoT) has issued SIM-binding requirements that could affect how messaging apps verify a user’s registered mobile number, with the rules reported as scheduled to take effect on January 1, 2027, Business Standard reported on October 23.
Under the reported framework, WhatsApp and Telegram may stop functioning if the SIM associated with an account is removed, replaced or deactivated. The precise user experience will depend on implementation by the services and the applicable directions. Users should consult official DoT communications and app guidance before making changes to their devices or numbers.
Potential impact for users
People who use messaging apps on a secondary device, travel frequently, change SIM cards or keep an account linked to an inactive number may need to review their account setup. SIM binding is intended to strengthen the connection between an account and the mobile identity used to register it, but it can also create practical questions for people using multi-device features.
This is a forward-looking regulatory change, not a claim that every user has already lost access. Details should be checked against the final government directions and subsequent implementation notices.
Source
Business Standard, October 23, 2026. Read the report. Official updates: Department of Telecommunications.
