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As of August 3, 2019 phone calling will be much simpler. The 01, 044, 045 will be gone for national calling as will be the "1" on international calls and the need to add a "1" after 52 when calling a Mexican cell phone from another country.
911 Emergency Calls
All of Mexico has a 911 emergency service.
Calling in / to / from Mexico
Calling land line in Mexico from United States or Canada: Prefix: 011-52 Call: 011-52-415-111-1111
011 is international code; 52 is the country code for Mexico;. 415 is an area code
Calling a cell phone in Mexico from United States or Canada: Prefix: 011-52-1 Call: 011-52-1-415-111-1111
Calling US or Canada from Mexico: 001-area code-7 digit number
Canada or U.S toll-free #’s from U.S. To dial “toll free” calls to the USA or Canada, replace the 800, 866, 877, 888 prefix as below. Example: to call the USA 800-947-5096 use 001-880-947-5096. Calls are not toll free and a fee will be charged.
USA Toll-free Substitute
Land line to land line in same city: No prefix, no area code Call 274-1111
Land line to cell phone in the same city: Prefix: 044 Call: 044-415-111-1111
Land line to cell phone in another city: Prefix: 045 Call: 045-322-111-1111
Land line to land line in another town: Prefix: 01 Call: 01-415-111-1111
Cell phone to cell phone in same city: Prefix: None Call: 415-111-1111
Cell phone to cell phone in another city: Prefix: 045 Call: 045-322-111-1111
Cell phone to land line in the same town: Prefix: None Call: 415-111-1111 or 111-1111
Cell phone to land line in another city: Prefix: 01 Call: 415-111-1111
Note some places such as Mexico City depending on service provider such as TelMex will have 8 digits as the main number.