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# The 671 Area Code and the North American Numbering Plan
The 671 area code serves Guam, an unincorporated territory of the United States located in the western Pacific Ocean. Established as Guam's primary area code, 671 is used for all telephone communications on the island, including landlines and mobile phones. This area code allows residents and businesses in Guam to connect with the broader North American telecommunications network while maintaining a distinct regional identifier. The 671 designation reflects Guam's status as part of the North American Numbering Plan, despite its geographic distance from the continental United States, ensuring seamless integration with the international dialing system.
The North American Numbering Plan (NANP) is a coordinated telecommunications system that assigns area codes to regions throughout North America, the Caribbean, and other affiliated territories. Managed by the International Telecommunication Union and implemented by various telecommunications authorities, the NANP ensures that each geographic area receives a unique three-digit area code to facilitate efficient call routing and organization. The system assigns codes based on population density, geographic boundaries, and administrative divisions. Guam's assignment of 671 exemplifies how the NANP extends beyond the continental United States to include territories and possessions, creating a unified numbering structure that enables consistent dialing procedures across all participating regions and simplifies international communications for residents and businesses.