Published: November 23, 2021
Area codes 514 and 438 form an overlay complex serving the city of Montreal with its boroughs and also some smaller municipalities in its immediate vicinity: Anjou, Dorval, Ile Perot, Lachine, Mont Royal etc.
On November 10, 2021 the new area code 263 was announced by the CNA (Canadian Numbering Administrator) and scheduled to enter service on October 22, 2022 as the relief method for the aforementioned overlay Numbering Plan Area.
The way calls are dialed in the area isn't changing with the activation of the new NPA.
See official planning letter (PDF document).