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Short, accurate explainers of how telephone numbering works — written so the directory pages make sense.
How North American area codes work What the three parts of a North American phone number mean, how area a…Overlay or split: how new area codes arrive An overlay adds a new area code over existing territory; a split carve…Calling a United States number from another country The exact dialing pattern for a US number from another country: the ex…Why you have to dial ten digits now Why you now dial the area code for local calls in the US, what overlay…N11 codes, 988 and toll-free numbers What 911, 411, 511, 811, 311 and 988 reach, how N11 short codes are re…Canada's area codes, province by province Canada uses the same +1 numbering plan as the US. How its area codes m…Caribbean countries inside the +1 numbering plan Jamaica, Trinidad, Barbados and more than a dozen other Caribbean plac…Finding the right area code for an address Find the area code for an address or ZIP the reliable way: rate centre…