For example, to call a fixed line in the C ITY Mexico must be marked: 011 + 52 + 55 and then the phone number. (011 is the international calling code US) (52 It is the country code) (55 It is the city code of CDMX) The area number to call Mexico to the city of Monterrey, the dial is: 011 + 52 + 81 and then the phone number You can also call a cell phone, using the cell code to call Mexico for this you must mark: 011 + 52 + 1, the city code and the telephone number. Which is the area to call Mexico and more specific Mexico code to call cell. It is the code to call Mexico cell, which is the country code for Mexico. As dialing from the US to Mexico The area codes of the largest cities in the country.