satisfied new market entrants leaving the business. With overlays in several areas (the relief method of choice in Canada since 2000), ten-digit local numbers were supplanting seven-digit dialing; by 2019, only four Canadian area codes (506, 709, 807 and 867) were still single-code areas (no overlay) and allowed seven-digit local dialing. Although fewer American area codes were overlaid, seven-digit dialing was also disappearing in the United States. 2020 to present On July 16, 2020, the FCC adopted rules to establish 988 as the three-digit phone number for the National Suicide Prevention Lifeline. This required 82 area codes to switch to mandatory ten-digit dialing by October 24, 2021, because they had already used 988 as a central office code. Similar transitions are scheduled in most parts of the remaining single-code areas in Canada by May 31, 2023, due in part to the rollout of 9-8-8 service in that country. See also Linked numbering scheme E.164 References North American Numbering Plan