# National ID Number When ordering a Virtual Mobile Number (VMN) you might be requested some additional information. One of the pieces of information that are required in the extra identification step is your National ID number.A national identification number is used by the governments of many countries as a means of tracking their citizens, permanent residents, etc. Depending on your country it can have different names, for example: * Rijksregisternummer in Belgium * Codice fiscale in Italy * Social Security Number in the US * Number of the national ID card in Germany * Het burgerservicenummer (BSN) in The Netherlands --- # 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/connectivity-platform/virtual-numbers/national-id-number.md?ask= ``` 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.