The international dialing code for Montserrat is +1 664. To call Montserrat from the United States or Canada, dial 011 + 1 664 + area code + local number. From Europe, dial 00 + 1 664 + area code + local number. On mobile phones worldwide, use +1 664 followed by the area code and local number.
From USA/Canada: 011 + 1 664 + local number. From UK/Europe: 00 + 1 664 + local number. From mobile phones: +1 664 + local number.
Country calling codes are standardized by the International Telecommunication Union (ITU). The Montserrat country code +1 664 is used to route international telephone calls to Montserrat from any country in the world.