NANPA Shortens 10-Digit Dialing NPA List, Identifies Carrier Milestones

The FCC’s 988 Order requires all telecommunications carriers, interconnected Voice over Internet Protocol (VoIP) providers, and one-way VoIP providers to make changes to their networks to implement 988 by July 16, 2022. To accomplish the goal of routing 988 directly to the National Suicide Prevention and Mental Health Crisis Hotline number, 1-800-273-TALK (8255), 82 area codes must transition to 10-digit dialing (10DD) before the implementation deadline.

The North American Numbering Plan Administrator’s (NANPA) list of area codes required to transition to 10DD has shortened from 87 to 82 due to NANPA removing 3 area codes that are already transitioning to 10-digit dialing due to an overlay and the return of 904-988 and 701-988.

Impacted NPAs
The area codes now required to transition to 10DD are:

Alaska 907
Alabama 251
Arkansas 501
Arizona 480, 520, 928
California 209, 530, 562, 626, 650, 707, 925, 949, 951
Colorado 719, 970
Delaware 302
Florida 321 (Brevard County), 352, 561, 941
Georgia 478, 912
Guam 671
Hawaii 808
Illinois 309, 618, 708
Indiana 219, 574
Iowa 319, 515
Kansas 620, 785
Kentucky 859
Louisiana 337, 504
Michigan 616, 810, 906, 989
Minnesota 218, 952
Mississippi 662
Missouri 314, 417, 660, 816
Montana 406
Nevada 775
New Hampshire 603
New Jersey 856, 908
New Mexico 505, 575
New York 516, 607, 716, 845, 914
North Carolina 910
Ohio 440, 513
South Dakota 605
Tennessee 731, 865
Texas 254, 361, 409, 806, 830, 915, 940
Vermont 802
Virginia 276, 804
Washington 509
Wisconsin 262, 414, 608, 920

Milestone Reporting
If your company serves any of the area codes on the NPA transition list, you must meet the following milestones and notify NANPA via when each milestone is completed. All emails must include: Provider Name, OCN(s), State(s) and NPA(s).  

The troubleshooting contact information must include: Provider Name, Primary Contact, Telephone Number(s), Hours of Operation, Backup Contact/Escalations, Email Address and Telephone Number(s).

Milestone Milestone Action Due Date
Send first customer notice Issue first customer education notice

Carriers using bill messages are encouraged to distribute notices for multiple months to help ensure customers are aware of the upcoming dialing changes.

Provide carrier contact information Provide carrier contact information to NANPA for troubleshooting of any permissive 10-digit dialing issues NOW – 4/10/2021
Implement permissive
10-digit dialing
Carrier deadline to have permissive 10-digit dialing opened in their networks

Carriers can implement this any time up to this deadline, no need to wait until the night before to implement

Send second customer notice Issue second customer education notice

Carriers using bill messages are encouraged to distribute notices for multiple months to help ensure customers are aware of the upcoming dialing changes.

Deadline for 10-digit signaling transition Carriers should be signaling/sending 10 digits of the called-to party for all calls terminating in all end offices and access tandems in the area code 9/24/2021
Carrier deadline to implement mandatory 10-digit dialing Carrier deadline to enforce mandatory 10-digit dialing

Carriers must remove 7-digit dialing and enforce 10-digit dialing


Please contact Bridget Alexander White or Lisa Cover in JSI’s Maryland office at 301-459-7590 to review the milestones, assist with customer notifications, and to manage your company’s milestone reporting.

Numbering & Porting Essentials Service

Clients interested in educating their staff on the cavalcade of numbering and porting requirements all service providers will face in 2021 should consider subscribing to JSI’s Numbering & Porting Essentials service. The subscription includes breaking news alerts, a free webinar and six web-based education sessions designed to keep companies informed about important numbering, porting and robocall mitigation decisions that will impact their internal operations and customers. Contact Bridget Alexander White for more details and to sign up.