Area Code 399
Area Code 399 Assignment
Area Code 399 History:
Area Code 399 has not been assigned for use by the North American Numbering Plan Administrator. Area Code 399 is officially designated an Expansion Code which is reserved for future use if it becomes necessary to expand the current ten digit format.
If you receive a phone call from area code 399 it is a spam call. Any phone number such as 399-xxx-xxx does not exist.