How can I change the mobile number linked to my demat account?

You go to the profile or account settings section of the broker’s app and select the option to update mobile number, which usually requires OTP verification on both the old number (if still accessible) and the new number, along with sometimes an additional identity re-verification step like Aadhaar OTP or a short video KYC confirmation, since mobile number changes are treated as a security-sensitive modification. If you no longer have access to the old number at all, the process typically requires more manual verification, sometimes involving a support request with supporting identity documents, since the broker needs to be confident the change request is genuinely coming from you. Many brokers apply a short holding period after a mobile number change, similar to a bank account change, during which certain actions like withdrawals might be temporarily restricted as a fraud safeguard. You complete this change well ahead of when you actually need the new number for login or OTP-based actions, to avoid getting locked out mid-transaction.