Calling Mexico from the United States explained:

• 011 - US exit code; dial first for international calls made from the USA or Canada
• 52 - Country Code for Mexico
• Phone Number - 10 digits, area code included
• sample call from US to a landline in Mexico City: 011 52 55 ???? ????

How to dial to Mexico cellular:

• dialing format for calls to a cell phone: 011 52 AA ???? ???? or AAA ??? ????
• AA/AAA is the area code

Area Codes:

Phone Books:

• Paginas Amarillas - Mexico Yellow Pages, in Spanish
• Seccion Amarilla - business searches, in Spanish

Updates:

• Mexico telephone numbering changes - August 3, 2019