Communications in Guam

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Though Guam is a United States territory, some U.S. long-distance plans and courier services list Guam as an international location. As a result of Guam's being added to the North American Numbering Plan (NANP) in 1997, calls made to the U.S., Canada, or other participating countries from Guam (or to Guam from other NANP locations) only require the caller to dial a 1 followed by the area code.^[1]

In this way, only domestic charges are incurred between the US and Guam on most carriers. Before Guam's inclusion, calling the U.S. required dialing the international 011 first, thus resulting in higher long-distance rates and less frequent calls to the U.S. by relatives in Guam. Prices of long-distance calls to these destinations have dropped significantly to the point where now calling the U.S. from Guam or calling Guam from the U.S. costs the same.