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> Block radio access technologies (RATs) for devices by coverage policy with the emnify Portal

Blocking [radio access technologies (RATs)](https://www.emnify.com/iot-glossary#rat) restricts devices from connecting to specific RATs in a network.
This helps you avoid unnecessary costs by ensuring devices only connect to the RATs they support.

You can manage the accessible RATs through [**Device Policies**](https://portal.emnify.com/device-policies) in the emnify Portal.
Changes apply to all devices assigned to the adjusted coverage policy.

> **Info**
>
> The Portal interface often refers to RATs as **radio access types**.

## Block a specific RAT

Navigate to [**Coverage Policies**](https://portal.emnify.com/device-policies#coverage-policies).

Choose the policy you want to update and expand the policy details.

Under **Coverage list**, select a country with available networks and expand the country details.

> **Info**
>
> The color of the network name indicates the following:
>
> * Green: Networks with data pools.
> * Blue: Networks with pay-per-use.
> * Red: Blocked networks.
> * Gray: Disabled networks.

Choose the network you want to limit and click **More**.

Select **Manage radio access types**.

Clear the checkboxes next to the RATs you want to block for this network.
For example, if you want to block NB-IoT, make sure the checkbox next to **NB-IoT** isn't selected.

> **Note**
>
> Some networks don't support all RATs.

Review and click **Apply**.

![](/_fern-files/emnify.docs.buildwithfern.com/89d253d35204c55784c97316cf0a7986445644caa000be6af61d514487e195d8/assets/gifs/emnify-portal/device-policies/coverage-policies-coverage-list-block-networks-rats.gif)

## Unblock a specific RAT

Under **Coverage list**, select the country with the network where you want to unblock a RAT and expand the country details.

Choose the relevant network and click **More**.

Select **Manage radio access types**.

Select the checkboxes next to the RATs you want to unblock.
For example, if you want to use 3G, make sure the checkbox next to **3G UMTS** is selected.

> **Note**
>
> Some networks don't support all RATs.

Review and click **Apply**.

## Check blocked RATs

Under a coverage policy's **Coverage list**, each country shows a **Blocked radio access types** count.
This is how you can identify which countries have networks with blocked RATs.
For example, if you block NB-IoT for two networks in Liechtenstein, the **Blocked radio access types** count shows as `2`.

When you expand the country details, you can see the blocked RATs for each network.

> **Tip**
>
> You can also sort the **Coverage list** by the number of blocked RATs in each country.
> Click the **Blocked radio access types** column header to sort the list in ascending or descending order.