exchange areas, each with its own prefix, but Iristel's 292 prefix is overlaid, with both using independent facilities. Numbering plan area Area code 867 is the most expensive geographic calling area in Canada. Iristel (the one major CLEC in the region) bills its subscribers in other area codes a 15¢/minute premium to call 1-867 numbers and charges a $20/year premium to issue a 1-867 number in-region instead of assigning the same subscriber any other Canadian area code. The digits were reportedly chosen to promote the theme "TOP of the world", as 867 spells TOP on a standard North American keypad. When combined with the NANP international dialing code 1, it spells 1867, which is the year of Canadian Confederation. It has the largest land area of any area code in the NANP. The territorial extent reaches from Cape Dyer on Baffin Island to the Alaska border, and from the south end of James Bay to the North Pole. The largest distances between exchanges are from Sanikiluaq to Grise Fiord, and from Beaver Creek to Pangnirtung. Four different official time zones are observed within the area: Eastern, Central, Mountain, and Pacific. Exchanges Area code 867 covers all points in the three Canadian territories, the Northwest Territories, Nunavut, and Yukon Some exchanges in the territories serve some customers in Fraser and Swan Lake, British Columbia (from Carcross and Swift River, respectively). Fitzgerald, Alberta, is served from Fort Smith, Northwest Territories. On a section of the Alaska Highway which crosses the BC-Yukon border six times in , two highway lodges and area residents on the Yukon side are served by Watson Lake (867) numbers, not the nearer Lower Post (250) exchange. Aklavik, NT: 375, 978 Arctic Bay, NU: 439 Arviat, NU: 205, 232, 341, 857 Baker Lake, NU: 793 Beaver Creek, YT: 362 862 Behchokǫ̀, NT: 292, 371, 392, 492, 731 Cambridge Bay, NU: 391 983 Cape Dorset, NU: 897 Carcross, YT: 733, 821 Carmacks, YT: 385, 863 Chesterfield Inlet, NU: 898 Clyde River, NU: 924 Colville Lake, NT: 709, 722 Coral Harbour, NU: 925 Dawson City, YT: 730, 991, 992, 993 Délı̨nę, NT: 589, 744 Destruction Bay, YT: 789, 841 Ekati Diamond Mine, NT: 880 Elsa, YT: 995 Enterprise, NT: 984 Faro, YT: 746 994 Fort Good Hope, NT: 496, 598 Fort Liard, NT: 770 Fort McPherson, NT: 377, 952 Fort Providence, NT: 373, 699 Fort Resolution, NT: 376, 394 Fort Simpson,