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Insert a hyphen after the first three digits.
When using the area code, use a hyphen (with no space on either side) between the two elements.
The "1-" does not always need to be included.
Ex: Please call me at 1-800-545-5474.
But: My number is 800-545-7547.
("1-" is not part of the number; it's just something you have to dial.)
Phone numbers with area codes should be written as (555) 555-5555
Area codes should be included within parenthesis, followed by one space.
I agree with Dr. Copeland.