International Calling Codes - Country Codes
To dial direct, dial the IDD prefix + country code + number.
Note: Calls to Canada, Puerto Rico, Guam, U.S. Virgin Islands, Northern Mariana Islands, and Caribbean countries listed below with an IDD prefix of 1 only require you to dial 1 + area code + number just like you call numbers within the United States. No country, city, or international access codes are required.
Customers calling from the United States to a mobile number in Mexico must dial a "1" after the Mexico country code of "52" and before the 10-digit local number.
See also: Related Long Distance Calling topics