Prefix Information
The prefix 400 is part of area code 820 serving Unknown, Unknown.
This exchange contains 10,000 possible phone numbers (820-400-0000 through 820-400-9999).
Phone numbers with prefix 400 in area code 820. Location: Unknown, Unknown.
The prefix 400 is part of area code 820 serving Unknown, Unknown.
This exchange contains 10,000 possible phone numbers (820-400-0000 through 820-400-9999).