[Yandex Cloud documentation](../../../index.md) > [Yandex Cloud Notification Service](../../index.md) > [Step-by-step guides](../index.md) > SMS notifications > Adding a test phone number

# Adding a test phone number

A _sandbox_ is a test environment, in which you can send SMS messages only to _test phone numbers_.

Each test phone number is registered in a channel using a confirmation code from an SMS. By adding a number, you agree to receive messages to it.

To add a test phone number:

{% list tabs group=instructions %}

- Management console {#console}

  1. In the [management console](https://console.yandex.cloud), select the folder you want to create a notification channel in.
  1. Navigate to **Cloud Notification Service**.
  1. Select an SMS notification channel you need.
  1. Navigate to the ![image](../../../_assets/console-icons/handset-arrow-in.svg) **Test numbers** tab.
  1. Click **Add test phone number**.
  1. In the window that opens, enter a phone number and click **Get code**. An SMS with a confirmation code will be sent to the specified phone number.

      Russian phone numbers in [E.164](https://en.wikipedia.org/wiki/E.164) format are supported, e.g., `+79991112233`.

  1. Enter the code from the SMS and click **Confirm**.

{% endlist %}