# NB-IoT sensors

You must have **Administrator** or **Manager** permissions to perform this action.

## Before you start

Before adding sensors, ensure that:

* you have a valid **sensor licence** to add sensors,
* you have a valid licence that allows you to activate NB-IoT SIM card. 

Both licences can be obtained by entering an **activation code**. If you did not add the activation code during onboarding, you can do it at any time in the **Licence Manager** section.

## Adding NB-IoT sensors

To configure NB-IoT sensor:

1. download the [Efento mobile application](https://play.google.com/store/apps/details?id=pl.efento.cloud\&hl=en) from Google Play store
2. Log into your Efento Cloud account, navigate to the main menu (three lines in the upper left corner)
3. Select **Organisation settings** -> **Add sensors** -> choose  **NB-IoT**
4. Follow the on-screen instructions to complete the configuration process.

## Troubleshooting

If you are not able to add a sensor use the following guidance to resolve common problems:

* Ensure the sensor is **powered on**.
* Confirm the sensor is within the **coverage area of the NB-IoT network**.
* Verify that the **SIM card is properly installed and activated** in the device.
* Check the **PLMN and APN settings**. If you are unsure how to configure them, start by setting both to **“Auto”**. If the issue persists, contact your **connectivity provider** for the correct settings.
* Make sure the sensor has not already been **added to another Organisation**, as this may prevent it from appearing in your list.

If problems persist after these steps, consult the support team at [help.efento.io](https://help.efento.io) for further assistance.


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