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Ten-digit dialing. Ten-digit dialing is a telephone dialing procedure in the countries and territories that are members of the North American Numbering Plan (NANP). It is the practice of including the area code of a telephone number when dialing to initiate a telephone call. When necessary, the ten-digit number may be prefixed with the trunk ...
The 9th digit is an automatically generated check digit using the "Modulus 10 Double Add Double" technique based on the Luhn algorithm. To calculate the check digit every second digit is multiplied by two. Letters are converted to numbers based on their ordinal position in the alphabet, starting with A equal to 10. TBA CUSIP format
10-10-321, 10-10-345, 10-10-220, and 10-10-987 are United States long-distance phone services best known for their prolific television and direct mail advertising in the late 1990s. 10-10-321 was the first mass-marketed service of its type. 10-10-345 was owned by AT&T, and the rest were all owned by Telecom USA, which was owned by MCI; MCI is now part of Verizon.
Zone 5 uses eight 2-digit codes (51–58) and two sets of 3-digit codes (50x, 59x) to serve South and Central America. Zone 6 uses seven 2-digit codes (60–66) and three sets of 3-digit codes (67x–69x) to serve Southeast Asia and Oceania. Zone 7 uses an integrated numbering plan; two digits (7x) determine the area served: Russia or Kazakhstan.
1. International access. 011. List of dialing codes. The North American Numbering Plan ( NANP) is a telephone numbering plan for twenty-five regions in twenty countries, primarily in North America and the Caribbean. This group is historically known as World Zone 1 and has the telephone country code 1. Some North American countries, most notably ...
The IATA codes were originally based on the ICAO designators which were issued in 1947 as two-letter airline identification codes (see the section below). IATA expanded the two-character-system with codes consisting of a letter and a digit (or vice versa) e.g. EasyJet's U2 after ICAO had introduced its current three-letter-system in 1982. Until ...
For example, in the NYPD system, Code 10-13 means "Officer needs help," whereas in the APCO system "Officer needs help" is Code 10-33. The New Zealand reality television show Ten 7 Aotearoa (formerly Police Ten 7 ) takes its name from the New Zealand Police ten-code 10-7, which means "Unit has arrived at job".
Service area. Area codes 656 and 813 are assigned to a numbering plan area (NPA) that comprises all of Hillsborough County, the city of Oldsmar in Pinellas County, and the central and southeastern portions of Pasco County. The northeastern portion of Pasco County has area code 352, while the western portion uses area code 727 .
Area codes 809, 829, and 849 are telephone area codes in the North American Numbering Plan (NANP) for the Dominican Republic.Like all NANP members, the Dominican Republic uses country code 1, and has similar dialing procedures for dialing the ten-digit national telephone numbers, which consist of the area code, a three-digit central office code, and a four-digit line number.
This area code was therefore required to transition to ten-digit dialing, mandatory after October 24, 2021. [1] With a forecast that numbers would run out by 2023, area code 472 was approved for use in the numbering plan area beginning on October 7, 2022.