1. Log in to your Citibank online banking account.
2. Navigate to the "Card Activation" section.
3. Enter your card details as prompted.
4. Verify your identity through OTP sent to your registered mobile number or answer security questions.
5. Follow the on-screen instructions to complete the activation process.
For any assistance, you can contact Citibank Card activate number at 1-888-388-4751. They are available to help you activate your card without the physical card