Area Code 400
Area Code 400 Assignment
Area Code 400 History:
Area Code 400 has not been assigned for use by the North American Numbering Plan Administrator. Area Code 400 is officially designated an Easily Recognizable Code.
When the second and third digits of an area code are the same, that code is called an easily recognizable code (ERC) and assigned to specific services such as toll-free services.
If you receive a phone call from area code 400 it is a spam call. Any phone number such as 400-xxx-xxx does not exist.