# Registration Number

If a Virtual Mobile Number (VMN) for a certain country is not available in ['Buy a number'](https://dashboard.messagebird.com/en/numbers/modal/buy-number) menu, this means that either we do not offer numbers for this country or purchasing a number is linked to certain requirements. In this case, please reach out to our Support team via [this page](https://www.messagebird.com/contact) for assistance. To buy a number in certain countries, it is often a requirement to provide a *registration number*. When you register a business in your home country, you always get a registration number. For the US, you can find more information [here](https://www.ftc.gov/tips-advice/business-center/selected-industries/registered-identification-number-frequently-asked).