It is only seven digits, so it doesn't start with a 3-digit area code. In the past, seven digit phone numbers in the United States would just default to whateve

It is only seven digits, so it doesn't start with a 3-digit area code. In the past, seven digit phone numbers in the United States would just default to whatever area code you were calling from. Now we need to enter all ten digits, area code included, due to mobile phones and such. That number could, and does, exist for many US area codes.