# Number restrictions in China

{% hint style="danger" %}
As of November 2023, due to industry-wide changes, Bird has discontinued call services to Mainland China.
{% endhint %}

Bird does not support call services to mainland China. This is due to the following regulations imposed by China:

* **Inbound calls only**: Chinese numbers are restricted to inbound calls and cannot be used for outbound calling.
* **International dialing only**: Chinese numbers can only receive calls from international, non-Chinese numbers. Calls with a Chinese caller ID will fail.
* **Long call duration required**: Due to strict spam monitoring and VoIP restrictions, numbers that regularly place calls under three minutes are likely to be blocked.
* **No unsolicited marketing**: Unsolicited marketing calls are prohibited.
* **Avoid high-volume, unanswered calls**: A high volume of unanswered outbound calls to Chinese numbers will result in calls being blocked.
* **Avoid repeat calls**: Repeated calls from the same origin number within one hour will result in numbers being blocked.
* **No toll-free numbers**: Using toll-free numbers for calling will result in that number being blocked.

{% hint style="warning" %}
China's strict telecommunication regulations are universal, and apply to Bird and all other carriers.
{% endhint %}

{% hint style="info" %}
Still got questions about VoIP numbers and China? [Reach out to support](https://app.bird.com/support-center/cases/new) to learn more.
{% endhint %}


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.bird.com/applications/channels/channels/supported-channels/numbers/concepts/number-restrictions-in-china.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.