Question: How do I activate the Capital One Platinum Mastercard Credit Card?
Answer: There are two (2) ways to activate your new Capital One Platinum Mastercard Credit Card
The first way to activate the Capital One Platinum Mastercard credit card is by calling the Capita One dedicated activation telephone number: 1-800-678-7820.
The second way to activate Capital One Platinum Mastercard is by activating online at capitalone.com/activate. The site will allow you to register or login to your Capital One to activate the card.