Why the Aadhaar-linked mobile number matters for demat eKYC

The single biggest reason people cannot complete an online demat account is surprisingly simple: their Aadhaar is not linked to the mobile number they currently use. Without that link, the OTP never arrives and eKYC cannot be completed.

Why the OTP matters

Online account opening uses Aadhaar-based verification. To confirm that the person applying really owns that Aadhaar, an OTP is sent to the mobile number registered with UIDAI. The same OTP method is often used again at the end, when the customer eSigns the application.

If the registered number is old, switched off, or belongs to someone else, the customer simply cannot finish.

How to check which number is linked

The customer can use the official UIDAI website or app to verify the mobile number linked to their Aadhaar. Typically, only the last few digits are shown, which is enough to confirm whether it is their current number.

Encourage customers to check this before starting the demat application. It takes a couple of minutes and prevents a half-finished form.

What if it is not linked or is outdated?

• The customer needs to update the mobile number through an authorised Aadhaar update process, usually at an enrolment or update centre.
• After updating, it can take some time before the new number works for OTPs.
• Only after that should they start the demat application.

There is no shortcut. Using a friend's number or a number that is "linked somewhere in the family" will not work and should never be attempted.

Other OTP problems and simple fixes

OTP arrives late

Network delays happen. Wait a minute before requesting another OTP; multiple requests can cause confusion.

OTP expired

Some OTPs are valid for a short time. Keep the SMS app ready and enter the code quickly.

Dual SIM confusion

If the linked number is in the second SIM slot, make sure that SIM has signal and can receive SMS.

DND or SMS blocking apps

Some spam-blocking apps hide OTP messages. Check the blocked or spam folder.

Alternatives when online eKYC is not possible

Some brokers offer offline or assisted KYC, where documents are verified differently. It is usually slower. If the customer cannot update their Aadhaar mobile soon, they can check whether the broker supports another route on its official website.

Why this protects everyone

The OTP step proves the customer's identity and consent. It protects them from someone opening an account in their name. As a referral partner, you should never ask for or enter these OTPs. If a customer offers to share an OTP with you, politely refuse and explain why.

A helpful pre-check message

"Before we start, please check that your Aadhaar is linked to the mobile number you use now. The application needs an OTP on that number. If it's not linked, we'll wait until it's updated."

This small message saves time and shows you understand the process. For the complete list, read the demat documents checklist.

Common situations you will see

• A parent's number on the child's Aadhaar: common for young adults whose Aadhaar was made when they were children. The OTP goes to the parent's phone. The young adult should update to their own number for future use.
• A number from an old job or SIM that was surrendered: the OTP goes nowhere. An update is the only fix.
• A number that is active but rarely used: check that the SIM is in a working phone and can receive SMS before starting.

The takeaway

A working Aadhaar-linked mobile number is the key that opens the online process. Check it first, update it if needed, and only then begin the application. It is the easiest way to avoid a stuck application and a frustrated customer.