Telephone numbers in Mexico
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All telephone numbers in Mexico have ten digits, of which the first identifies one of the eight principal geographic regions of the country.
The national number is formed by prefixing the previously existing local number format with an area code. All ten digits must be dialed for all calls.
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Dialing prefixes
Since August 3, 2019, only the following dialing prefixes are available for use within Mexico:
Dialing into Mexico
Destinations in Mexico are dialed from foreign location by dialing the foreign country's International access code (011 within the NANP area, 00 in many other countries), the country code 52, and the ten-digit national telephone number of the destination. As of 2020, the dialing procedure for mobile phones in Mexico no longer requires the inclusion of the number '1' after the country code. The procedure for calling landlines remains unchanged.
History
Until August 3, 2019, telephone numbers in Mexico consisted of ten digits with either two-digit area codes (for Mexico City, Monterrey, and Guadalajara and their respective metropolitan areas) or three-digit area codes for the rest of the country. 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). Since the 1960s, the Bell System had already established technical infrastructure to include Mexico in the NANP routing system, and continued to maintain special dialing arrangements using NANP area codes 903 (northwest Mexico) and 905 (Mexico City) from the US into Mexico, because of high community interest into the 1980s. Use of the area codes was formally discontinued on February 1, 1991, requiring callers to use international dialing.
Area codes
Major cities and metropolitan areas have the following codes: