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When an additional (overlay) code is assigned, generally 1 10 digit dialing becomes mandatory.
In some areas, this led to early resistance to overlay codes, but this has usually been outweighed by the preference to avoid number changes for existing subscribers.
On the other hand, area codes that covered an entire state had the digit 0 in the middle.
In contrast to the area code, the second digit of the three-digit exchange code was never 0 or 1, thus affording a simple rule for recognition of whether a user was dialing a full ten-digit telephone number or merely dialing within the local area code using seven-digit dialing.
Since 1995, over 380 new area codes were added to the North American Numbering Plan.
Some areas used area code splits, by which an existing numbering plan area (NPA) was split into multiple divisions each assigned a new area code.
Even in closed numbering plans, it is not always necessary to dial all digits of a number.
For example, geographic areas were designed so that tributary routes were placed into the same area as the major toll center., states that were anticipated to require more than about 500 central offices were split into multiple areas, each receiving a code with the middle digit being 1.
Telephone numbering plans are defined in each of administrative regions of the public switched telephone network (PSTN) and they are also present in private telephone networks.