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This guide walks you through activating a new Citi® credit card, from the details you need to have ready to what to do once your card is active. You must activate your card before you can make purchases with it.
This is an independent, unofficial guide. It never asks for your card number, SSN, or personal details. Only enter that information on official Citi channels such as Citi.com/activate, the Citi Mobile® App, or the phone number on the back of your card.

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Choose how to activate

Online

Activate at Citi.com/activate in a few minutes.

By Phone

Call the number on the back of your card.

Mobile App

Follow the prompts in the Citi Mobile App.

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Get started

1

Gather your details

Have your card and personal information ready. See Activation Quickstart.
2

Pick an activation method

Use online, phone, or the Citi Mobile App.
3

Start using your card

Sign the back of your card and make purchases. See After Activation.