The best eSIM for Guam depends on how much data you need, but for a typical trip eSIM Ahora offers plans from $5.73, activated by QR code in about 30 seconds with no roaming from your home carrier. A 3 GB, 30-day plan costs $14.12. You connect, with top-ups available and nationwide coverage. Compatible with iPhone XS or newer, Samsung Galaxy S21+ and Google Pixel 3+.
Full-speed data every day; after the daily cap the speed is reduced.
Full speed up to 500 MB/day, then 512 Kbps.
Every eSIM can be installed within 180 days of purchase. Plan validity starts when you first connect.
Your eSIM picks between these networks on its own. If you see bars and nothing loads, you can pick one by hand.
Your Guam eSIM runs on one network: GTA Wireless. Other local networks won't carry your data: if you see signal bars and nothing loads, turn off automatic network selection (iPhone: Settings → Cellular → your eSIM → Network Selection; Android: Settings → Network & internet → SIMs → your eSIM) and pick GTA Wireless by hand.
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.