# How to change mobile device

At Mattermost, we are using our mobile devices daily at work. This how-to document provides guidance on what steps you need to take when planning to migrate to a new phone.

**Note:** If you’ve lost your mobile phone, please refer to the [How To Handle a Lost Mobile Device](https://handbook.mattermost.com/company/how-to-guides-for-staff/how-to-change-mobile-device/how-to-handle-a-lost-mobile-device) guide.

## **GSuite two-factor authentication**

For GSuite two-factor authentication, please follow these steps:

1. Open [https://myaccount.google.com/security](https://myaccount.google.com/u/1/security).
2. Select **2-Step Verification**.
3. You'll be prompted to log in again to prove your identity.
4. Select **Change Phone** and follow the provided steps.
5. (Optional) If you’ve changed your phone number, update the phone number in the **Google Security Center** as well.

## **Okta two-factor authentication**

For Okta two-factor authentication, please follow these steps:

1. Open <https://mattermost.okta.com/>.
2. Log in with your Okta credentials and authentication code from your old mobile device. If you can't sign in, please reach out to the IT team.
3. Select your name in the top right and select **Settings**.
4. If the **Edit Profile** button appears, enter your password if prompted.
5. In the **Security Methods** section, depending on the two-factor method you're using, it will show you **Remove** or **Set up another**.
6. Please choose **Remove** to remove your old device and **Set up another** to add your new device and follow the instructions on the screen.

For detailed steps-by-step instruction, please go to the links below:

* **Andriod user** : <https://help.okta.com/eu/en-us/Content/Topics/end-user/ov-reset-register.htm>
* **iOS user** : <https://help.okta.com/eu/en-us/Content/Topics/end-user/ov-ios-reset-register.htm>


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