All of Mexico has a 911 emergency service.
Local calls: all numbers are 10 digits – area code plus phone number. In Mexico City, for example, 551-234-5678 is the format.
To call Mexico from the US and Canada, the country access code is 011. To call from Mexico to Canada and the US the access code is 001. On a cell phone, +1 will do this automatically by country.
800 Numbers
To call 800 numbers in the US and Canada from Mexico, you must substitute numbers.
Calls are not toll-free and a fee will be charged.
USA/Canada Toll-free Change to:
800 880
844 885
855 884
866 883
877 882
888 881