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# Block operators on specific devices

> How to block operators on specific devices using the emnify Portal

emnify's mobile core network manages the network selection from the network side in conjunction with the SIM settings.
It has a global view of the available radio networks, their supported features, and live network status.
This view helps temporarily or permanently steer SIMs away from 'low signal quality' networks and to the networks with the strongest signal.

The manual carrier switching can be done in two ways:

* Select the preferred operator in the device's menu.
* Block other operators using the emnify Portal or emnify REST API.

> **Note**
>
> Adding a network to the **Blocked Operators** list doesn't prevent your devices from trying to connect to those networks.
> You still see the attempts in the **Events** tab, but emnify's mobile core rejects any connection attempt.
> You should only use this feature to solve technical issues associated with specific operators.

## Individual device

### Block an operator

[Log in to your emnify account](https://portal.emnify.com/sign).

Navigate to your [**Connected Devices**](https://portal.emnify.com/connected-devices).

Find the device where you wish to block an operator and click anywhere on the table row to open the device details.

![](/_fern-img/5e9d57b9ecd656a188b27845b2bb9ff90f1fe7fb7af7a460265b2bc7265610c9.webp)

Locate the **Blocked Operators** section and click **Edit**.

![](/_fern-img/1d7242e6a8511d5bc0fb182a96198465fe4a453f915bfc090dd80fa6154623ff.webp)

Select the operator you want to block.
The following example blocks two operators, **France - Orange** and **France - SFR**.

![Networks blocklist dropdown filtered by France, with France - Orange and France - SFR selected](/_fern-img/1c12c496e97af045c03d9f80e3eb059532180fd359b06c75bc8a8c145dd53d21.webp)

> **Success**
>
> Changes save automatically and the blocked operators are shown on the **Device Details**.

![Blocked Operators section listing France - Orange and France - SFR](/_fern-img/020047da670df08ab708babe4cffab5b6ebf465ca00eb9481d9e92d71d799d04.webp)

### Remove an operator from the blocklist

Navigate to your [**Connected Devices**](https://portal.emnify.com/connected-devices).

Find the device with the blocked operator and click anywhere on the table row to open the device details.

![](/_fern-img/5e9d57b9ecd656a188b27845b2bb9ff90f1fe7fb7af7a460265b2bc7265610c9.webp)

Locate the **Blocked Operators** section and click **Edit**.

![](/_fern-img/4b3b92a17cc646e1a36a6821424bfd58ae1ad65b646f68130b09b8020a195cdb.webp)

Click the **X** next to the blocked operator you wish to remove.
The following example removes the **France - Orange** operator from the blocklist.

![](/_fern-img/64b2eac623bdd5653ed95b0d7b4c8afa0192fce09507d8660d35596f33a32428.webp)

Changes save automatically and the updated blocked operators are shown on the **Device Details**.

![Blocked Operators section listing only France - SFR](/_fern-img/b1782a1196166881e16f5540ed2c79661d4f33764562723746f7e2aa1a6b3ef6.webp)

## Multiple devices in bulk

It's also possible to select several devices on the Portal and update the blocked operators list for all of them simultaneously.

Navigate to your [**Connected Devices**](https://portal.emnify.com/connected-devices).

Search for the devices where you wish to block an operator and select the checkbox next to every relevant device.

![Connected Devices table with checkboxes selected for Walking Mobile, TravelSpot, and PocketTalker](/_fern-img/31ec9ecaf7f92053a7d4d75ae8e59f3ecb88dba6cd64b1b9ffb87cb73220b683.webp)

A new menu at the top of the page provides bulk operations.
Select **More** and then **Block Networks**.

![](/_fern-img/23dd7acaf7268d2c8c762b3f205555f9e13f7a899f97d71caeba81263a48f745.webp)

Select the operators you want to block for these devices from the **Networks blocklist** dropdown menu.
The following example blocks the operator **France - Orange**.

![](/_fern-img/15078ce340b5f5287cfb09fe99304f5f82ecc13f23dc966dee113433014a549c.webp)

Review and click **Save**.

![](/_fern-img/36cb01dc0a0dc097b7c12693dba2f72a68ad05c420850d95a1feec7bac2cb2ac.webp)

## Block operators with the emnify REST API

You can also configure blocked operators using the following emnify REST API calls:

* [List Operator Blocklist for an Endpoint](/developers/api/endpoint/endpoint-operator-blacklist-by-endpoint-id-get)
* [Add an Operator to the Blocklist](/developers/api/endpoint/endpoint-operator-blacklist-by-ep-id-and-operator-id-put)
* [Remove an Operator from the Blocklist](/developers/api/endpoint/endpoint-operator-blacklist-by-ep-id-and-operator-id-delete)