You can activate your Capital One Platinum card online, using the Capital One mobile app, or by phone. You'll need your 16-digit card number and the card’s security code. The card won't work until it's activated to help prevent fraud..
How do I activate my Capital One card?
Activating your Capital One card is a straightforward process. Follow these steps to get started:
Go to CapitalOne.com/Activate using your web browser.
If you already have a Capital One online account, log in with your username and password. If not, you'll need to sign up for an account, which only takes a few minutes.
Once logged in, enter the required information from your new card, including the card number, expiration date, and CVV code.
As an additional security measure, you may be asked to verify your identity. This could involve answering security questions or receiving a verification code via text message or email.
Follow the prompts on the screen to complete the activation process.
Once activation is successful, you'll receive confirmation, and your Capital One card will be ready to use.