---
title: "Lost Phone with Duo App"
canonical: "https://tech.calpoly.edu/space/CPKB/9142592/Lost%20Phone%20with%20Duo%20App"
format: markdown
---
### Problem

"I lost my phone. What do I do? How do I authenticate?"

### Solution

You will need to authenticate with your backup device, and then remove the lost mobile device from your Duo account.

1. Log in to the [My Cal Poly Portal](https://myportal.calpoly.edu/).
2. Click the **Personal Info tab **>Under **Personal Info** > **Authorized Devices** > **Multi-factor Authentication** > Click** Edit**.
3. Authenticate with your backup device (a <span style="color: #091e42">secondary mobile device like a tablet, landline, or token</span>).   
*Once you finish authenticating, you will see the Device Management page, with your current devices listed.*
4. Click **Edit (pencil icon)** for the device you wish to remove, and then click **Delete**.
  
5. You will be prompted to confirm the deletion. Click the **Delete…** button in the prompt to confirm.

> ℹ️ If you do not have a backup device, contact the [ITS Service Desk](https://calpoly.atlassian.net/wiki/spaces/CPKB/pages/909246477) for assistance. After the Service Desk deletes the device, you will be able to add a new device. Remember, your password will still protect your account.

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