CNAP Rule: What happens if your SIM is registered in someone else's name? Rules changing from tomorrow

CNAP Rule: A major change to mobile calling rules is set to take effect on November 1st. Moving forward, the caller's name will appear on your screen even for calls from unknown numbers. But what if you are using a SIM card registered in someone else's name—whose name will be displayed? Here’s what you need to know.

CNAP Rule: Starting tomorrow, November 1st, calling regulations for millions of phone users across the country will undergo a significant shift. Telecom companies are set to roll out the 'Caller Name Presentation' (CNAP) service nationwide. Previously, when an unknown number called, only the number would appear on the screen; identifying the caller often required the use of third-party caller ID apps.

From tomorrow, however, the caller's real name will appear on your phone screen without the need for any additional apps. The Department of Telecommunications has taken this major step to curb the rising menace of cyber fraud and spam calls. Yet, this new rule has raised a significant question for the millions of people who use SIM cards registered in the names of their parents, siblings, or other family members.

If the SIM is in someone else's name, whose name will appear on the screen?

In India, it is quite common for a SIM card to be purchased using the ID of an elder family member—such as a father, mother, or sibling—while being used by someone else in the household. With the implementation of the CNAP rule, the primary concern is: whose name will be displayed when a call is made? According to the regulations, the CNAP system relies entirely on the telecom companies' KYC (Know Your Customer) database.

In other words, the person whose Aadhaar card or identification document was used at the time of purchasing the SIM is considered the 'official' owner in the company's records. Therefore, if you are using a SIM registered in your father's name and you call an unknown number, it is your father's name—not yours—that will appear on the recipient's screen. If you want your own name to appear when you make a call, you must contact your telecom operator to have the SIM card transferred to your name or ported accordingly.

What happens to numbers already saved in your contacts?

This new government-mandated caller ID system will function differently—and far more reliably—than third-party apps. In third-party apps, users could set any name they chose; however, the CNAP (Calling Name Presentation) system will pull names directly from the verified records held by telecom companies. When an unknown person calls you, their mobile number will appear at the top of the display, with the name of the SIM card owner—as per their official government documentation—shown directly beneath it.

Conversely, if you have already saved a person’s number in your contact list under a specific name, that is the name that will appear on the screen. Furthermore, if a call originates from abroad, the screen will explicitly indicate "International Call" alongside the number, helping users stay alert against potential scams from foreign numbers.

What are the rules for companies?

In the initial phase, starting tomorrow, this feature will be enabled by default for all 4G and 5G network users across the country. You will not need to download any additional apps or adjust any settings on your phone. A separate rollout for users on 2G and 3G networks will follow later. Specific regulations have also been established for businesses and companies.

If a company wishes for its own name or brand name to appear when calls are made from its employees' phones, it must provide its GST or trademark registration documents to the telecom operator to update the registered name. Additionally, to safeguard user privacy, companies have been instructed not to store the caller's name in their systems once a call has ended.