To Dial Guam, you should start with dialing the GU international code +1 then the appropriate area code and the local number.

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How to dial Guam
Example phone dialings for Guam
NationalInternational
Fixed Line(671) 300-1234+1 671-300-1234
Mobile(671) 300-1234+1 671-300-1234
Fixed Line Or Mobile(671) 300-1234+1 671-300-1234
Toll Free(800) 212-3456+1 800-212-3456
Premium Rate(900) 212-3456+1 900-212-3456
Personal Number(500) 234-5678+1 500-234-5678