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Just got your new Citi credit card? You don’t need a laptop or a phone call to start using it — you can activate it right from your smartphone in under 5 minutes. Whether you use iPhone or Android, the Citi Mobile® App makes activation fast, secure, and hassle-free. Here are the 5 easy steps to get your card ready to use.

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What You’ll Need

Before you start, keep these handy:
  • Your new Citi credit or debit card
  • Your smartphone with an internet connection
  • The last 4 digits of your SSN
  • Your date of birth
  • Your Citi Online User ID and Password (or be ready to enroll)

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Step 1: Download the Citi Mobile® App

Head to your device’s app store and install the official Citi app:
Always download the app directly from the official app store to avoid fraudulent copies.

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Step 2: Sign In or Enroll

Open the app and either:
  • Sign in with your existing Citi Online User ID and Password, or
  • Tap Register / Enroll to create a new account using your card number and personal details.
New users will be asked to verify identity with SSN and date of birth.

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Step 3: Open the Card Activation Menu

Once signed in:
  1. Tap the menu icon (three lines) in the top corner.
  2. Select Card Services.
  3. Tap Activate Card.

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Step 4: Enter Your Card Details

Type in the following exactly as they appear on your card:
  • 16-digit card number
  • Expiration date
  • 3-digit CVV (found on the back of the card)
Double-check for typos before continuing.

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Step 5: Confirm and Activate

Tap Activate. Within seconds, you’ll see an in-app confirmation message that your card is now active and ready to use.
That’s it! Your Citi credit card is now activated and ready for in-store, online, and mobile wallet purchases.

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Bonus: What to Do Right After Activation

Make the most of your new card by taking these quick actions:

Add to Mobile Wallet

Add your card to Apple Pay, Google Pay, or Samsung Pay for contactless payments.

Enable Alerts

Turn on transaction and fraud alerts in the app for real-time notifications.

Set Up AutoPay

Never miss a payment by scheduling automatic monthly bill payments.

Create a PIN

Set up a PIN under Services → Manage PIN for ATM use and international travel.

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Troubleshooting

Make sure you entered the card number, expiration date, and CVV correctly. Restart the app and try again.
Use the Forgot User ID / Password option on the sign-in screen, or call Citi at 1-800-950-5114.
Verify your billing address, check your available credit, and make sure the card is added to your mobile wallet correctly.
Never share your card number, CVV, PIN, or Citi login credentials with anyone. Citi will never ask for these via text or email.

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Final Thoughts

Activating your Citi credit card on your phone takes just 5 easy steps and less than 5 minutes. With the Citi Mobile App, you get instant access to activation, account management, alerts, and payments — all from the palm of your hand. Download the app, follow the steps above, and start enjoying your new card today.