To activate your Capital One credit card using the Capital One mobile app, first download and install the app from the Apple App Store or Google Play Store if you haven't already. Open the app and log in with your Capital One username and password. Once logged in, navigate to the section where your new card is displayed, which might be on the main dashboard or under the "Accounts" section. To verify your details and confirm receipt of the card, look for the option to activate your card, which is typically titled "Activate Card" or something similar. After completing these steps, your card should be activated and ready to use. If you encounter any issues, you can contact Capital One customer support through the app or by calling the number on the back of your card.

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