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Official Languages: English, Chamorro

English is widely spoken and is the main language used in tourism, transport, and most services.

Mobile Network: Mobile coverage is generally good in populated areas including Tumon, Hagatna, and main roads. Coverage can be weaker in more remote coastal or inland spots. Speeds are commonly adequate for maps, messaging, and normal travel use.

Roaming/SIM/eSIM: For short stays, roaming can be convenient but may be expensive depending on your home carrier. A local SIM can be better value for longer stays if your phone is unlocked, especially for regular calls and data on island networks. An eSIM is often the easiest option if your device supports it, since you can set it up before arrival and compare prices without visiting a shop. Check whether your plan treats Guam the same as the mainland United States, because some carriers price it differently.

Cards are widely accepted at hotels, larger restaurants, supermarkets, and malls. Small local food places, market vendors, and some taxis may prefer cash, so carrying some US dollars is useful.

Tipping follows common United States practice. In restaurants with table service, around 15 to 20 percent is typical if service is not already included. Hotel housekeeping, bell staff, and drivers may also be tipped. Check the bill first, as some places may add a service charge.

Plug Type: Type A and Type B

Voltage: 110V, 60Hz

Adapter: Visitors from the United States typically do not need an adapter. Visitors from many other countries usually need a plug adapter, and some may also need to check device compatibility with 110V power.