The international dialing code for Niue is +683. To call Niue from the United States or Canada, dial 011 + 683 + area code + local number. From Europe, dial 00 + 683 + area code + local number. On mobile phones worldwide, use +683 followed by the area code and local number.
From USA/Canada: 011 + 683 + local number. From UK/Europe: 00 + 683 + local number. From mobile phones: +683 + local number.
Country calling codes are standardized by the International Telecommunication Union (ITU). The Niue country code +683 is used to route international telephone calls to Niue from any country in the world.