As A Number Format
As the familiarity of overlay plans and 10-digit-dialing required areas has increased, the phrase "10-digit dialing" is now sometimes used to describe the normal inclusion of area code in long-distance dialing.
Read more about this topic: Ten-digit Dialing
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“In proportion as our inward life fails, we go more constantly and desperately to the post office. You may depend on it, that the poor fellow who walks away with the greatest number of letters, proud of his extensive correspondence, has not heard from himself this long while.”
—Henry David Thoreau (1817–1862)