Dialing within Mexico:
Land line to local land line phone - dial the seven digit number (i.e. 143-1234)
Land line to long distance land line phone - dial 01 then the ten digit number (i.e. 01-612-123-1234)
Land line to local cell phone - dial 044 then the ten digit number (i.e. 044-624-122-1234)
Land line to long distance cell phone - dial 045 then the ten digit number (i.e. 045-612-123-1234)
Cell phone to local or long distance land line - dial the ten digit number (i.e. 624-143-1234)
Cell phone to local or long distance cell phone - dial the ten digit number (i.e. 612-122-1234)

Dialing into Mexico:
To dial a land line phone - Dial 011-52 then the ten digit number (i.e. 011-52-624-143-1234)
To dial a cell phone - Dial 011-52-1 then the ten digit number (i.e. 011-52-1-624-122-1234)

Dialing from Mexico to the US/Canada
Dial 001 then the ten digit number (i.e. 001-303-333-3333)

Dialing from Mexico to the rest of the world
Dial 00 then the Country Code and phone number

Dialing US Toll Free Numbers
For 800 numbers - dial 001-880 then the seven digit number
For 866 numbers - dial 001-883 then the seven digit number
For 877 numbers - dial 001-882 then the seven digit number
For 888 numbers - dial 001-881 then the seven digit number

List of Mexico's newly updated Area Codes

American Society of Mexico: 011-525-202-4600 Information from Americans who are living in Mexico.
Association of Mexican Banks: 011-525-512-3103
Automotive Industry Association: 011-525-272-1144
Border Trade Alliance: 619-661-9BTA Promoting trade along the U.S.-Mexico border.
British & Commonwealth Society: 011-52 (55) 256-0901
Canacintra: 011-525-563-3400 The Mexican National Chamber of Industry & Manufacturing.
Consulates of Mexico, in the United States & Canada.
Embassies & Chambers of Commerce, Both of Mexico & various other nations.
FONATUR: 011-525-543-7211, 011-525-687-7437 or (U.S.) 202-728-1639
     Offering foreign investment in Mexico's tourism industry.
Irish Society of Mexico: 011-52 (55) 523-5251
Mexican Association of Realtors - AMPI: 011-52-5-514-1640
     Most real estate office belong to this association.
Mexican Commerce Department: 011-525-709-6328 The Mexican equivalent to the US Commerce Department.
Mexican Franchise Association: 011-525-524-8043 Provides information about franchising in Mexico.
Mexican Government Tourism: 800-44-MEXICO The Department of Tourism offering information on Mexico.
Mexico City Tourist Assistance: 011-525-250-0123 or 250-0151 This agency can assist you with any questions about or problems you may have in the capital.
Mexico's Wildlife Department: 011-525-574-5489 Information on hunting in Mexico.
Ministry of Agriculture and Water Resources: 011-525-584-0096
Ministry of Commerce and Industrial Development: 011-525-650-4771
Ministry of Education: 011-525-521-9574
Missing Persons Hotline in Mexico City: 011-525-658-1111
National Museum of Anthropology: 011-525-553-6381 The Mexican National Museum of Anthropology.
National Railroads of Mexico (FNM): (52) 5-547-1084 Reservations or information. Or write to: Ferrocarriles Nacionales de Mexico, Gran Estación Central de Buena Vista, 06358 Mexico D.F., Mexico.
Consumer Protection (PROFECO): (52) 5-547-1084 Protects foreign tourists & residents.
Procuraduria Federal del Consumidor, Ave. Jose Vasconcelos 208, Col. Condesa, Distrito Federal, Mexico
011-525-211-1659
San Antonio Economic Development Foundation: 512-226-1394 Develops and promotes trade with Mexico.
SECOFI: 011-52-66-340-201 Performs some of the funtions like the US Department of Commerce, and regulates maquiladoras.
SEMATUR: 011-52-5-286-1267, in La Paz 011-52-112-5-3833, in Santa Rosalia 011-52-115-2-0014 Provides information and reservations for the ferries crossing the Sea of Cortez.
State Tourism Offices in Mexico, provides information on particular states.
Trade Commission of Mexico: (L.A.) 213-628-1220, (Dallas) 214-688-4095,
(N.Y.) 212-826-2979
Aid to businesses needing company contacts in Mexico.
U.S. Commerce Department: 202-482-4464; 202-482-0300 Country Desk-Mexico. They can help businesses export their goods to Mexico and also supply trade data.
World Trade Center of Mexico City: 011-52-5-682-9822 Business center & exposition area.