Travel Preparation Guide · Connectivity
Power & Connectivity (SIM)
Connectivity may vary by region and season.
Voltage & Plug Types
Electrical standards and outlet shapes
⚡110V / 60Hz
🔌Type A / B(Flat 2-pin (same as US/Japan))
🔄Not needed from Japan/US
💡US territory—same outlets as the United States.
Buying a SIM Card
Where to buy, costs, and activation process
📱GTA, IT&E, Docomo Pacific
🏪Airport area shops, carrier stores in Tumon
📋Passport or ID required
💰Prepaid SIM from $20-40 for 7-30 days
💡US carriers may have roaming coverage; local SIMs cheaper for extended stays.
eSIM & Mobile Wi-Fi
eSIM availability and portable Wi-Fi rental
📶Available
🏢Airalo, Ubigi, T-Mobile eSIM (US roaming)
💰$8-25 for 1-10GB / 7-30 days
💡US eSIM plans from T-Mobile include Guam; international eSIMs also work.
Wi-Fi Availability
Public Wi-Fi coverage and security
📡Good — well-connected US territory
🏨Fast and free in most hotels
☕Available in malls, cafes, and some public areas
💡Tumon tourist area has good WiFi coverage in hotels and restaurants.
Internet Restrictions & VPN
Blocked services and VPN recommendations
🔒None — unrestricted internet
🚫None — all services freely accessible (US territory)
🛡️Not needed
💡As a US territory, Guam has the same internet freedom as the mainland US.
Useful Local Apps
Must-have apps for transport, translation, and maps
🚗Stroll Guam (local shuttle), rental cars
🗺️Google Maps, Apple Maps
💬iMessage, WhatsApp, LINE (Japanese tourists)
💡Rental car is essential; limited public transit available.
International Calls
How to make international calls and alternatives
📞+1-671 (Guam)
🆘911 (Police, Fire, Ambulance)
📲Dial 011 + country code + number for international calls
💡Uses US phone system; domestic US calls dial 1 + area code + number.