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CountryCode.org is your complete guide to make a call from anywhere in the world, to anywhere in the world. This page details Guam phone code.
The Guam country code 1-671 will allow you to call Guam from another country. Guam telephone code 1-671 is dialed after the IDD. Guam international dialing 1-671 is followed by an area code.
The Guam area code table below shows the various city codes for Guam. Guam country codes are followed by these area codes. With the complete Guam dialing code, you can make your international call.