# Resetting Device Identifiers

Trouble seeing a cross-promotion campaign? This usually happens when you're trying to cross-promote apps that have already been installed on your device. Chartboost knows not to show ads for these apps.

To fix this, reset your device advertising identifiers. Here's how:


## iOS



1.   Go into your device's  **Settings**.
2.   Select  **Privacy**.
3.   Select  **Advertising**.
4.   Select  **Reset Advertising Identifier**.


![](/assets/images/articles/2023_advertising_tools_resettingdeviceidentifiers_001-ios.png){: width="300"}

![](/assets/images/articles/2023_advertising_tools_resettingdeviceidentifiers_002-ios.png){: width="300"}

![](/assets/images/articles/2023_advertising_tools_resettingdeviceidentifiers_003-ios.png){: width="300"}

![](/assets/images/articles/2023_advertising_tools_resettingdeviceidentifiers_004-ios.png){: width="300"}



## Android

-   Go into your device's  **Google Settings**.
-   Select  **Ads**.
-   Select  **Reset advertising ID**.
-   Select  **OK**.



![](/assets/images/articles/2023_advertising_tools_resettingdeviceidentifiers_001-android.png){: width="300"}

![](/assets/images/articles/2023_advertising_tools_resettingdeviceidentifiers_002-android.png){: width="300"}

![](/assets/images/articles/2023_advertising_tools_resettingdeviceidentifiers_003-android.png){: width="300"}

![](/assets/images/articles/2023_advertising_tools_resettingdeviceidentifiers_004-android.png){: width="300"}



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