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  1. Seven-digit dialing is a telephone dialing procedure customary in some territories of the North American Numbering Plan (NANP) for dialing telephone numbers in the same numbering plan area (NPA). NANP telephone numbers consist of ten digits, of which the leading three are the area code.

  2. Oct 19, 2021 · 1:18. Seven-digit dialing is out, 10-digit dialing is in. Starting Sunday, Oct. 24, callers in 82 area codes across 35 states and one U.S. territory will be required to use their...

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  4. Jul 17, 2018 · Telephone engineers created a 7-digit system for “all number calling” to expand their pool of possible number combinations. The first 3 digits would correspond to a certain phone service provider, and the last 4 digits would remain as a personal calling code.

  5. MrDowntown. • 10 yr. ago • Edited 10 yr. ago. This varied by city and phone company, but for large cities whose phone companies were part of the Bell System, it was usually after World War II. In 1948, for example, Chicago shifted to 2 letter + 5 digit dialing, already in use in some other big cities and becoming a Bell System standard.

  6. Because two area codes reside in the same geography, all calls must be dialed using the area code + the seven-digit telephone number (10 digits). (Some states require 1+10-digit dialing) What is an area code overlay? What is 10-digit dialing?

  7. Area Codes; Alaska: 907: Alabama: 205, 251, 256, 334: Arkansas: 479, 501, 870: Arizona: 480, 520, 602, 623, 928: California: 209, 213, 310, 323, 408, 415, 510, 530, 559, 562, 619, 626, 650, 661, 707, 714, 760, 805, 818, 831, 858, 909, 916, 925, 949, 951: Colorado: 303, 719, 970: Connecticut: 203, 860: District of Columbia: 202: Delaware: 302 ...

  8. There will be a new dialing procedure for areas of the country that use 7-digit dialing and 988 is used as the first three numbers in seven-digit phone numbers. To complete all local calls, consumers will need to dial their area code + telephone number.

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