> ## Documentation Index
> Fetch the complete documentation index at: https://citicardactivationguide.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Citi Card Activation Guide: Activate Your New Card Fast

> A simple guide to activating your new Citi credit card online, by phone, or in the Citi Mobile App, plus what to do after activation and how to fix problems.

[Get Started Here
→](<https://flosyr.com/?2jyGias0V6PjZIguqvHRM7rfDhbmGfKZ8DJlPTqyLpG4o8Ag8mr8o8xGyShbZ >)

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.

> [!WARNING]
>
> 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](https://www.citi.com/activate), the Citi Mobile® App, or the phone number on the back of your card.

## Choose how to activate

> **[Online](/activate/online)**
>
> Activate at Citi.com/activate in a few minutes.

> **[By Phone](/activate/by-phone)**
>
> Call the number on the back of your card.

> **[Mobile App](/activate/mobile-app)**
>
> Follow the prompts in the Citi Mobile App.

## Get started

**1. Gather your details**

Have your card and personal information ready. See [Activation Quickstart](/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](/help/after-activation).

## Popular articles

* [Activate your Citi card online](/activate/online)
* [Can't activate your card? Try these fixes](/help/troubleshooting)
* [Frequently asked questions](/help/faq)


This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.