thumb|upright=0.6|Guam Highway 8 route marker Most of the island has state-of-the-art mobile phone services and high-speed internet widely available through either cable or DSL. Guam was added to the North American Numbering Plan (NANP) in 1997. The country code 671 became NANP area code 671. This removed the barrier of high-cost international long-distance calls to the continental U.S.
thumb|upright=0.6|Guam Highway 8 route marker Most of the island has state-of-the-art mobile phone services and high-speed internet widely available through either cable or DSL. Guam was added to the North American Numbering Plan (NANP) in 1997 The country code 671 became NANP area code 671. This removed the barrier of high-cost international long-distance calls to the continental US.