Editing Ten-digit dialing (section)

==Ten-digit dialing in non-overlay areas==
A few area codes not part of any overlay complex nonetheless require ten-digit dialing if part of the local calling area is within an overlay complex. For example, the [[Fort Knox]] [[United States Army|Army]] base in [[Kentucky]] is served by [[area code 502]], but its local calling area includes cities that are served by the [[Area codes 270 and 364|270/364 overlay complex]]. As a result, Fort Knox imposed ten-digit dialing for all off-base numbers when the 270/364 overlay was established in 2014.<ref>{{cite press release|url=http://www.fkgoldstandard.com/content/ten-digit-dialing-takes-effect-feb-1-all-local-callers |title=Ten-digit dialing takes effect Feb. 1 for all local callers |publisher=Brandenburg Telephone<!--Release was printed verbatim by the Fort Knox newspaper.--> |date=2014-01-09 |access-date=2015-05-22}}</ref>

[[File:Area Codes US 10D changing L48.svg|thumb|400px|Area codes (in blue) affected in the lower 48 states. <!-- not including [[Alaska]] ([[Area code 907|907]]), [[Guam]] ([[Area code 671|671]]), and [[Hawaii]] ([[Area code 808|808]]) -->]]

A July 2020 order by the [[Federal Communications Commission]] required ten-digit dialing of telephone numbers with area codes in the United States that were not overlaid, but had an assignment of the central office prefix ''988'', conflicting with its designation for the [[National Suicide Prevention Lifeline]] by federal law.<ref>{{cite web|url=https://docs.fcc.gov/public/attachments/FCC-20-100A1.pdf|publisher=Federal Communications Commission|date=2020-07-16|title=Implementation of the National Suicide Hotline Improvement Act of 2018; Report and Order FCC-20-100|access-date=2020-12-22}}</ref>

NANPA Planning Letter 544 cites 83 area codes affected in 37 states. Three additional area codes were already transitioning to ten-digit dialing as the result of overlay implementations. Central office code 988 was in the process of discontinuation for [[area code 904]].<ref name="pl544">{{cite web|url=https://www.nanpa.com/sites/default/files/planning_letters/PL-544.pdf|date=2020-08-14|publisher=NANPA|title=Transition to 10-digit dialing (for 988 as 3-digit access to National Suicide Prevention Hotline)|access-date=2025-02-18}}</ref> While included in the list of 83 area codes, [[area code 701]] in North Dakota will not be converted to ten-digit dialing because the 32 telephone numbers in the 988 central office were reassigned to another prefix.<ref>{{cite news|url=https://ecfsapi.fcc.gov/file/1218227524725/NDPSC%20communication.pdf|access-date=2020-12-22|date=2020-12-18|publisher=North Dakota Public Services Commission|first=Victor|last=Schock|title=Re: Implementation of the National Suicide Hotline Improvement Act of 2018}}</ref> Several of these codes have subsequently been converted to overlay complexes and the implementation of such complexes could be expedited as the transition to ten-digit dialing was not necessary.

As part of Canada's implementation of a national 9-8-8 hotline, the [[Canadian Radio-television and Telecommunications Commission]] (CRTC) announced in August 2022 that all remaining Canadian non-overlay areas with seven-digit dialing, most of which use "988" as a central office code under their respective area codes, were required to convert to ten-digit dialing by May 31, 2023. A partial exception was granted for the three northern territories served by [[area code 867]], which was not projected to exhaust until at least 2043; only the [[Yellowknife]] area (which contains the 988 exchange) was required to convert, with seven-digit dialing remaining optional elsewhere in the region due in part to unique geographical and cultural considerations.<ref>{{cite web|url=https://crtc.gc.ca/eng/archive/2022/2022-234.htm|title=Telecom Regulatory Policy CRTC 2022-234: Introduction of 9-8-8 as the three-digit abbreviated dialing code for mental health crisis and suicide prevention services and Northwestel Inc.'s application for modified implementation of ten-digit local dialing|author=[[Canadian Radio-television and Telecommunications Commission]]|date=2022-08-31|access-date=2022-09-06}}</ref>