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, sign 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.
You can get Capital One to activate your credit card online or by calling customer service at (800) 227-4825.
If you prefer to do it online, just go to Capital One’s activation page and log in (create an account, if necessary). Then, enter the 3-digit security code on the back of the card when prompted. Through the … read full answermobile app, sign in with the same information as your online account. Tap your profile, then “Account Settings,” then “Activate Credit Card.” Enter the 3-digit security code when prompted to activate the card. The card will be available to use for purchases immediately after.
Call Capital One customer service at (800) 227-4825 from the number linked to your account.
Visit Capital One’s credit card activation web page, sign into your online account (enroll for an account if necessary), and when prompted, enter your 3-digit security code on the back of your card. If you don’t have an online account, you’ll have to enroll for one.
Through the Capital One mobile app, log in with the same details as your online account. Tap your profile, then "Account Settings", then "Activate Credit Card". Enter the 3-digit security code when prompted to activate the card.
The card will be available to use for purchases immediately after activation.
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