To call to Guam use the international country calling code +1 followed by the national phone number you want to call. Guam is located in Oceania and uses Dollar. It has around 167 543 inhabitants, 67 000 landlines and 98 000 cell phone users.
The country code +1 indicates that the phone number you are about to dial is to Guam in Oceania. Before you call to Guam you should be aware of that they speak English 43.6%, Filipino 21.2%, Chamorro 17.8%, other Pacific island languages 10%, Asian languages 6.3%, other 1.1% (2010 est.). You can see the exact location of this country code on the maps below.