International area code 656 is assigned to Mexico, specifically the northern region. When making an international call to a landline or mobile phone in this area of Mexico, you would dial 011 (the international access code from North America), followed by 52 (Mexico's country code), and then 656 (the area code), followed by the specific phone number. This area code mainly serves Ciudad Juarez, Chihuahua, Mexico, a major city on the border with the United States.