# Simulating network connections and conditions for your AWS Device Farm runs
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You can use network shaping to simulate network connections and conditions while testing your Android, iOS and web apps in Device Farm. For example, you can simulate lossy or intermittent internet connectivity.

When you create a run using the default network settings, each device has a full, unhindered Wi-Fi connection with internet connectivity. When you use network shaping, you can change the Wi-Fi connection to specify a network profile like **3G** or **Lossy WiFi** that controls throughput, delay, jitter, and loss for both inbound and outbound traffic.

**Topics**
+ [Set up network shaping when scheduling a test run](#network-shaping-how-to-choose-a-curated-profile-when-scheduling-a-test-run)
+ [Create a network profile](#network-shaping-how-to-create-a-network-profile)
+ [Change network conditions during your test](#change-network-conditions-during-test)

## Set up network shaping when scheduling a test run
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When you schedule a run, you can choose from any of the Device Farm-curated profiles, or you can create and manage your own.

1. From any Device Farm project, choose **Create a new run**.

   If you don't have a project yet, see [Creating a project in AWS Device Farm](how-to-create-project.md).

1. Choose your application, and then choose **Next**.

1. Configure your test, and then choose **Next**.

1. Select your devices, and then choose **Next**.

1. In the **Location and network settings** section, choose a network profile or choose **Create network profile** to create your own.  
![\[Network profile for a test run\]](http://docs.aws.amazon.com/devicefarm/latest/developerguide/images/aws-device-farm-set-up-network-profile.png)

1. Choose **Next**.

1. Review and start your test run.

## Create a network profile
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When you create a test run, you can create a network profile.

1. Choose **Create network profile**.  
![\[Create a new network profile\]](http://docs.aws.amazon.com/devicefarm/latest/developerguide/images/aws-device-farm-create-a-new-network-profile.png)

1. Enter a name and settings for your network profile.

1. Choose **Create**.

1. Finish creating your test run and start the run.

After you have created a network profile, you'll be able to see and manage it on the **Project settings** page.

![\[Network profiles in Project settings\]](http://docs.aws.amazon.com/devicefarm/latest/developerguide/images/aws-device-farm-network-profiles-in-project-settings.png)


## Change network conditions during your test
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You can call an API from your device host using a framework like Appium to simulate dynamic network conditions such as reduced bandwidth during your test run. For more information, see [CreateNetworkProfile](https://docs.aws.amazon.com/devicefarm/latest/APIReference/API_CreateNetworkProfile.html).