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Coverage available in major cities and tourist areas.
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GTA (Guam Telephone Authority, now privatized), Docomo Pacific (Japanese NTT Docomo subsidiary) and IT&E are the main operators in Guam. Excellent 4G+ across Tumon Bay (tourist zone), Hagåtña (capital), Tamuning, Yigo and Mangilao. 5G rollout 2023-2025 in Tumon and military areas. Guam is an unincorporated US territory — some USA eSIMs include Guam, others don't (verify before buying). Military coverage (Andersen AFB, Naval Base) is restricted to authorized personnel. Underwater/caves: Talofofo Falls area has coverage, deep caves don't. Type A/B US plugs, 110V/60Hz.
Fly into Antonio B. Won Pat (GUM); taxi to Tumon ~20-30 USD, shuttle ~10-15 USD. Currency US dollar (USD) — Guam uses USD despite being non-state territory. Mid-range dinner 25-40 USD, mid-range hotel 150-300 USD in Tumon. Direct flights from Japan (3.5h, popular), Korea, Philippines and Hawaii. Tumon Beach is the resort zone. Two Lovers Point, Talofofo Falls, Latte Park (Chamorro culture). Excellent diving (Tokai Maru, Blue Hole). Chamorro cuisine (kelaguen, red rice, kadu). Drive on the right (US). US passport no visa; many countries have waivers.