Capital One Activate :
Once your new card is in hand, activation takes just minutes.
Activate your card as soon as it arrives, and you can start enjoying all it has to offer.
- Sign in to your account—online or on the Capital One Mobile app. (Text “MOBILE” to 80101 for a link to download).
- Choose the account linked to your debit card.
- Look for a button to activate your card next to the debit card delivery tracker online, or below your account balance in the mobile app.
- Select “Activate Your Card” and follow the steps shown. You may be asked to set a PIN to complete the activation process.
Can I lock my debit card?
Yes, you can—anytime, anywhere.
Locking your debit card will prevent transactions until you unlock it. Keep in mind that this won’t prevent automatic bill payments or other scheduled transfers from occurring.
- Sign in to your account—online or on the Capital One Mobile app. (Text “MOBILE” to 80101 for a link to download).
- Select the account linked to your debit card
On the web: Choose “Account Services and Settings.” 
• Under “Manage Debit Card”, choose “Lock Your Card” and follow the steps. 
On the app: Select “Lock Card” from the “I Want To…” menu. 
