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History. After the breakup of the Soviet Union, the country used an open numbering plan, having a varying number of digits.Local telecommunications regulators had planned to abandon this system by 2009, but postponed the changeover until 2010, later pushed once more until 2012 and finally approved for implementation in the period of 2020–2025.
Toll-free telephone numbers in the North American Numbering Plan. Toll-free telephone numbers in the North American Numbering Plan have the area code prefix 800, 833, 844, 855, 866, 877, and 888. Additionally, area codes 822, 880 through 887, and 889 are reserved for toll-free use in the future. 811 is excluded because it is a special dialing ...
Telephone numbers in Argentina. In Argentina, area codes are two, three, or four digits long (after the initial zero). Local customer numbers are six to eight digits long. The total number of digits is ten, for example, phone number (11) 1234-5678 for Buenos Aires is made up of a 2-digit area code number and an 8-digit subscriber's number ...
E.164 is an international standard ( ITU-T Recommendation), titled The international public telecommunication numbering plan, that defines a numbering plan for the worldwide public switched telephone network (PSTN) and some other data networks . E.164 defines a general format for international telephone numbers.
In order to standardize the mobile numbering plan in Brazil, ANATEL started gradually rolling out the change to nine digits in other area codes and states as well. The last three states to implement the ninth digit in mobile numbers (the Southern states of Paraná , Santa Catarina and Rio Grande do Sul , corresponding to area codes 41 through 55 ) did so on 6 November 2016. [2]
The International Telecommunication Union (ITU) has established a comprehensive numbering plan, designated E.164, for uniform interoperability of the networks of its member state or regional administrations. It is an open numbering plan, however, imposing a maximum length of 15 digits to telephone numbers.
Russia has an open numbering plan with 10-digit phone numbers. Trunk prefix is 8 (or 8~CC when using alternative operators, where CC is 21–23, 52–55). International call prefix is 8~10 (or 8~CC when using alternative operators, where CC is 26–29, 56–59).
