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To call Guam from the U.S. Click to find Guam prepaid phone cards.

Dial 1 + City Code + Phone Number

Guam City Codes

City NameCity Code

Interesting Facts

Guam was ceded to the US by Spain in 1898. Captured by the Japanese in 1941, it was retaken by the US three years later. The military installation on the island is one of the most strategically important US bases in the Pacific.