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Country codes are defined by the International Telecommunication Union (ITU) in ITU-T standards E.123 and E.164. The prefixes enable international direct dialing (IDD). Country codes constitute the international telephone numbering plan. They are used only when dialing a telephone number in a country or world region other than the caller's.
+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.
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.
This is a list of international dialing prefixes used in various countries for direct dialing of international telephone calls.These prefixes are typically required only when dialling from a landline, while in GSM-compliant mobile phone (cell phone) systems, the symbol + before the country code may be used irrespective of where the telephone is used at that moment; the network operator ...
Kazakhstan has been sharing the country code 7 with Russia since its independence in 1991. In 2021, ITU reserved the code 997 [2] for Kazakhstan, and the country planned to activate it in January 2023. In early 2023, however, Kazakhstan applied for a change of code to 77. [3] In late 2023, Kazakhstan decided to keep the country code 7. [4]
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Area code dialing is optional in most geographical area codes, except Moscow (area codes 495, 498, 499); it is mandatory for non-geographical area codes. E.123 international and Microsoft formats are used for writing local phone numbers as well; international prefix and country code 7 are replaced with trunk code 8 (or 8~CC) when dialing a ...
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