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New area codes were assigned in the overlay format to address number exhaustion: in 2017, Toluca and Puebla and in 2018, León, Mexico City, and Tijuana. In the early development of International Direct Distance Dialing (IDDD), Mexico elected to join World Zone 5, instead of joining the North American Numbering Plan (NANP). [ 5 ]
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.
For example, for a number in Costa Rica they would write (506) 2222-2222 instead of +506 2222-2222. On the other hand, Guatemala does have the custom of using the + sign. It is quite common for Central American businesses to write the whole phone number, including the country code in parentheses, on business cards, signs, stationery, etc.
Country code: 52; International call prefix: 00; Trunk Prefix: none; The telecommunication services of Mexico are provided by a division of the telephone numbering plan into groups of area codes for the following regions: [1]
FMCSA list of states, United States Department of Transportation, Federal Motor Carrier Safety Administration - List of states and abbreviations. Accessed on line July 14th, 2023. Appendix I – Mexican State Codes, United States Customs and Border Protection (CBP), Automated Export System Trade Interface Requirements.
The parentheses were used originally to indicate that the area code was not necessary for local dialing. The NPA-part of the number has the formal format NXX, since 1995 identical to the format of central office codes. The Government of Canada's Translation Bureau also recommends using hyphens between groups; e.g. 250-555-0199. [43]
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These shared country codes will coexist with all other E.164-based country codes assigned by the ITU. The resource of the shared country code consists of a country code and a group identification code (CC + GIC) and provides the capability for a group of countries to provide telecommunication services within the group.