7 to 10 digit dialing migration for 80+ area codes to accomodate new 988 Suicide Prevention Hotline

In order to meet the technical requirements for the activation by July 16, 2022 of the new 988 National Suicide Prevention and Mental Health Crisis hotline, a number of US numbering plan areas currently enjoying 7 digit dialing for local calls and also using 988 as a central office code (the 3 digits we dial after the area code) will have to migrate to 10 digit dialing. There is going to be a permissive dialing period during which people residing in towns and cities affected by this change can get used to the new dialing method.

7 to 10 digit dialing transition schedule

  • April 24, 2021 – permissive dialing period begins (calls may be dialed using 7 or 10 digits, the latter is encouraged)
  • October 24, 2021 – 10 digit dialing becomes mandatory

List of affected NPAs

StateArea code(s)
Alaska907
Alabama251
Arkansas501
Arizona480, 520, 928
California209, 530, 562, 626, 650, 707, 925, 949, 951
Colorado719, 970
Delaware302
Florida321 (Brevard County), 352, 561, 941
Georgia478, 912
Guam671
Hawaii808
Illinois309, 618, 708
Indiana219, 574
Iowa319, 515
Kansas620, 785
Kentucky859
Louisiana337, 504
Michigan616, 810, 906, 989
Minnesota218, 952
Mississippi662
Missouri314, 417, 660, 816
Montana406
Nevada775
New Hampshire603
New Jersey856, 908
New Mexico505, 575
New York516, 607, 716, 845, 914
North Carolina910
Ohio440, 513
South Dakota605
Tennessee731, 865
Texas254, 361, 409, 806, 830, 915, 940
Vermont802
Virginia276, 804
Washington509
Wisconsin262, 414, 608, 920

See official NANPA planning letter for more information (PDF document)

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