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An area code is a three-digit number that identifies a geographic region within the North American Numbering Plan (NANP). The NANP covers the United States, Canada, and several Caribbean nations, all sharing the +1 country code.
Area codes were introduced in 1947 to facilitate direct long-distance dialing without operator assistance.
Geographic codes serve a specific region exclusively. These were the original area codes assigned to each area.
Overlay codesshare the same geographic region as an existing code. They're introduced when the original code runs out of available numbers.
No, area codes don't distinguish between cell phones and landlines in North America. With number portability, people can keep their number when switching carriers or even moving to a different area, so the area code only indicates where the number was originally assigned.
Large metropolitan areas like New York, Los Angeles, and Toronto have multiple area codes because they've run out of available phone numbers. When this happens, overlay area codes are introduced to provide more numbers while allowing existing numbers to remain unchanged.
In most areas with overlay codes, 10-digit dialing (area code + 7-digit number) is required for all calls, even local ones. Some areas with only geographic codes still allow 7-digit dialing for local calls, but this is becoming less common.
Yes, with number portability, you can keep your phone number (including area code) when you move or switch carriers. This is why area codes no longer reliably indicate where a caller is currently located.
Some area codes have special uses: 800, 888, 877, 866, 855, 844, and 833 are toll-free numbers; 900 numbers are premium rate services; 911 is emergency services; and 411 is directory assistance. These aren't assigned to geographic regions.