Discover Card Help Center
New Card Activation
How do I activate my new Discover Card?
If I activate my card online, what information do I need?
You will need the 3-digit code following the letter "A" on the back of your new card.
What if I received multiple new cards? Can I activate all of them online?
You can activate all your new cards online, however, if they have different 3-digit codes, you will need to activate each one separately.Activate My Discover Card