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The only big difference is there’s an “aggressive” phase outlined in my method that will replace out all the common delimiters and then try to format a number out of it. The widespread adoption of fax, modem, and mobile phone communication, as well as the deregulation of local telecommunication services in the United States during the mid-1990s, increased the demand for telephone numbers. The growth and expansion of area codes in the United States necessitated the creation of organizations to manage their allocation and administration. Number portability has already been implemented on a national level, allowing individuals to keep their phone numbers when switching service providers or moving to a different area.

A transition period prior to splitting provides a period of "permissive dialing" during which seven-digit dialing is still permitted. Today, area codes are used throughout the United States and Canada, as well as in many other countries around the world.

When multiple NPA codes serve an area in an overlay arrangement, ten-digit (10D) dialing is required.

In the telephone number 212–555–1234, the NPA represents the area code, while the NXX represents the central office code.By accepting all cookies, you agree to our use of cookies to deliver and maintain our services and site, improve the quality of Reddit, personalize Reddit content and advertising, and measure the effectiveness of advertising. It was already common practice for decades that the digits 0 and 1 could not appear in the first two digits of the central office codes, because the system of using the first two letters of familiar names for central offices did not assign letters to these digits. Subtle variations of these techniques have been used as well, such as dedicated overlays, in which the new code is reserved for a particular type of service, such as cellular phones and pagers, and concentrated overlays, in which a part of the area retained a single code while the rest of the region received an overlay code. Mexican participation was planned, [11] but implementation stopped after three area codes (706, 903 and 905) had been assigned, and Mexico opted for an international numbering format, using country code 52.