How to call Guam

dial 011 + 1 + phone number

Calling Guam from the United States explained:

Information about country:

Guam, officially the Territory of Guam, is an island in the western Pacific Ocean and is an organized, unincorporated insular area of the United States. It is one of five U.S. territories with an established civilian government. The island's capital is Haga. Guam is the largest and southernmost of the Mariana Islands.