If you lost your Capital One Platinum card, you must report it as soon as possible at the following phone number: (800) 227-4825. Capital One will lock that card and issue you a new one.
Meanwhile, if you have online access, you can also temporarily lock the card from your online banking account. Once you’re logged in, select “View Account”, click on “I Want To” and then on “Lock Card". Another way to do it is via Capital One’s mobile app by scrolling down to the “Card Help” section and tapping “Lock Card”.
You can activate a Capital One Platinum card online, through the Capital One mobile app or by phone, at (800) 227-4825. Activation requires both the 16-digit card number and the card’s security code. To minimize fraud, the card is not useable until it’s activated.
To activate the Capital One Platinum card online, … read full answersign in to your account or create an online account, if you don’t already have one. After logging into your account from either the website or mobile app, just click “Activate Your Card” on the account details page.
If activating by phone, call from the phone number you provided on the application. Otherwise, you will have to answer the security question you created when you applied for the card. Once activated, the Capital One Platinum card is immediately available for use.
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