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Area codes are also assigned for non-geographic purposes. The rules for numbering NPAs do not permit the digits 0 and 1 in the leading position. [1] Area codes with two identical trailing digits are easily recognizable codes (ERC). NPAs with 9 in the second position are reserved for future format expansion.
+7 is an ITU country code for telephone numbering. It was originally assigned to the Soviet Union . After the 1991 dissolution of the Soviet Union , the code continued to be used by the fifteen successor states , the majority of whom switched to own country codes from the + 3xx and + 9xx ranges between 1993 and 1998.
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.
The second area code, 202, was assigned to the District of Columbia. The allocation of area codes was readjusted as early as 1948 to account for inadequacies in some metropolitan areas. For example, the Indiana numbering plan area 317 was divided to provide a larger numbering pool in the Indiana suburbs of Chicago (area code 219). [citation needed]
zone code: the leading three digits; area code: the following one or two digits; subscriber number: the last six or five digits, depending on the length of the area code. Geographic numbers use zone codes in the range from 710 to 729. [5]
Mobile phones use geographic area codes (two digits): after that, all numbers assigned to mobile service have nine digits, starting with 6, 7, 8 or 9 (example: 55 15 99999–9999). 90 is not possible, because collect calls start with this number.
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The dialing code range 4xx was introduced on 1 December 2005 to replace 0xx, in order to make it possible to adopt the ITU convention of 0 and 00 dialing prefixes for local and international dialing respectively. The old '095' dialing code, along with 19 other Russian area codes starting with '0', expired on 31 January 2006. [17]