Prefix Information
The prefix 399 is part of area code 311 serving Unknown, Unknown.
This exchange contains 10,000 possible phone numbers (311-399-0000 through 311-399-9999).
Phone numbers with prefix 399 in area code 311. Location: Unknown, Unknown.
The prefix 399 is part of area code 311 serving Unknown, Unknown.
This exchange contains 10,000 possible phone numbers (311-399-0000 through 311-399-9999).