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Guam is part of the North American Numbering Plan, telephone country code +1, along with the USA, Canada, and a variety of other islands. Guam uses area code +1 671.
Calls from the US to Guam are dialed "one plus," and are considered domestic calls; however, they may or may not be included in "nationwide" calling plans. Calls from other NANP locations to Guam may be billed at higher rates than calls to the US mainland.
For many years, Guam had its own country code, +671, but it changed to +1 671 (or, from a US perspective, changed from 011-671 to 1-671) in 1997.
(The plus sign means "insert your international access prefix here." From a GSM mobile phone, you can enter the number in full international format, starting with the plus sign. The most common prefix is 00, but Japan uses 010, Australia uses 0011, and many other countries use different prefixes.)
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What is the country code of Guam?
The ares code for Guam is 671
What is the telephone country code of United States Minor Outlying Islands?
The same as the it is for the US. When I lived on Guam, the area code was 671 and anywhere within the US or any of the islands if you wanted to call Guam you just had to dial 1-671-xxx-xxxx and if you wanted to call from Guam to anywhere in the US you just dial a 1 plus the 3 digit area code followed by the 7 digit phone number. If there was a differing country code to dial to call Guam or any other of the US minor outlying islands (which are all inhabited btw) than every time I wanted to call home to Washington from Guam, I would have had to dial a country code on top of the area code as opposed to just the area code.
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