OceaniaHagatnaGuam eSIM and Travel Guide: Stay Connected on America's Pacific Island
Guam is the largest and southernmost island in the Mariana Islands chain, an unincorporated US territory and one of the most strategically significant American military bases in the Pacific. For visitors it is a tropical beach destination with American standards and infrastructure: English everywhere, US dollars, US plug sockets and fast mobile data. DoCoMo Pacific (a subsidiary of NTT DoCoMo Japan) was the first operator to launch 5G in Guam and is the primary network. IT&E is the largest locally-owned carrier with strong south island coverage. A Roamix Guam eSIM activates before you fly and connects at Antonio B. Won Pat International Airport, served by flights from Japan, Korea, the Philippines, Australia and Honolulu.
Key Takeaways
- DoCoMo Pacific launched Guam's first 5G and is the technology leader. IT&E has the widest overall coverage including the southern villages and naval base areas. GTA TeleGuam is the local alternative.
- A Roamix eSIM activates before departure and connects to the best available Guam network on landing at Won Pat International Airport, used by millions of Japanese, Korean and Australian tourists annually.
- Guam uses US standards throughout: US dollars, Type A and B 120V power sockets, US food labelling and US emergency number 911. No currency exchange needed for US visitors.
- Tumon Bay is the tourist epicentre: a crescent of beach lined with Japanese-catering resort hotels, duty-free shopping malls and restaurants. The island extends south to quieter villages, jungle waterfalls and WWII history sites.
- Guam is a key layover and transit hub for Japan-Australia and Japan-US routes. Even a 24 to 48-hour transit is enough to explore Tumon Bay and Two Lovers Point.
Quick Facts
Guam Connectivity
Get a Roamix Guam eSIM and land connected at Antonio B. Won Pat International Airport.
How to Stay Connected in Guam
Resort Wi-Fi in Tumon Bay is generally fast and reliable, particularly in upmarket Japanese-catering properties like the Guam Marriott, Westin and Hilton. Smaller guesthouses in Hagatna and the south villages have slower connections. DoCoMo Pacific 5G in Tumon Bay is often faster than resort Wi-Fi in practice.
Option
Best For
Notes
RecommendedRoamix eSIM
All visitors to Guam arriving from Asia, Australia, Europe or anywhere outside the US mainland
Activates before departure, connects to DoCoMo Pacific 5G or IT&E 4G on landing. No SIM purchasing, no US number complexity. Best choice for international visitors.
IT&E or DoCoMo Pacific local SIM
Long-stay visitors or those wanting the lowest possible local data rates
Available at IT&E or DoCoMo Pacific retail stores in Tumon Bay and the Micronesia Mall in Dededo. Requires passport. US-standard SIM registration process.
US carrier roaming (AT&T, T-Mobile, Verizon)
US domestic plan holders checking whether Guam is included
Some US domestic plans include Guam as part of their nationwide coverage. T-Mobile US domestic plans typically include Guam. Verify with your US carrier before travel: if included, this may be the most convenient option for US-based travellers.
Resort Wi-Fi
Evening use in your Tumon Bay hotel room
Fast and reliable at upmarket Tumon Bay resorts. Adequate for messaging, video calls and streaming. Not suitable as primary connectivity when exploring outside the resort.
For international visitors a Roamix Guam eSIM is the most convenient option, activating before you board your flight in Tokyo, Seoul, Sydney or Manila and connecting you to 5G data the moment you land. Get yours at roamix.app.
Get connected the moment you land in Guam.
Get your Guam eSIMMobile Networks in Guam
Guam has three mobile operators: DoCoMo Pacific (a subsidiary of Japan's NTT DoCoMo, operating 4G and Guam's first 5G network), IT&E (the largest locally-owned carrier with comprehensive islandwide 4G coverage including southern villages and military areas) and GTA TeleGuam (the legacy local carrier, now owned by a consortium, offering solid 4G). DoCoMo Pacific leads on technology and speed in the tourist Tumon Bay corridor and central Guam. IT&E has the most comprehensive geographic coverage, particularly in southern Guam villages, Inarajan and Umatac Bay. A Roamix Guam eSIM connects to the best available network for the most reliable combined experience.
First to launch 5G in Guam. Strongest 5G and 4G performance in Tumon Bay, Tamuning, Hagatna and the tourist north. Backed by NTT DoCoMo Japan technology. The premium choice for speed in the main tourist area.
Largest locally-owned carrier in Guam. Strong 4G coverage extending into the south of the island including Inarajan, Umatac, Merizo and the areas around Naval Base Guam. Good choice for travellers exploring beyond Tumon Bay.
Legacy local carrier with solid 4G covering central and northern Guam. Good reliability in Dededo and Yigo. Slightly weaker in the far south compared to IT&E.
Typical Speeds
DoCoMo Pacific 5G in Tumon Bay delivers 150 to 600 Mbps. IT&E 4G in central and southern Guam delivers 30 to 100 Mbps. GTA TeleGuam 4G delivers 20 to 80 Mbps.
5G Status
5G is live via DoCoMo Pacific across Tumon Bay, Tamuning and central Hagatna. Expanding south toward Dededo and Barrigada.
DoCoMo Pacific 5G speeds in Tumon Bay are genuinely fast. If you are uploading large video files for social media or streaming to your home, activate your Roamix eSIM before landing and you will have production-quality connectivity from the hotel. Japanese-market tourists in Guam often bring Japanese DoCoMo SIMs that roam natively; everyone else benefits from a Roamix eSIM.
The interior jungle of the central plateau and some southern coastal areas around Umatac Bay and Cetti Bay overlook areas can have weaker 4G signal. The Guam National Wildlife Refuge in the north tip and the Ritidian Beach area have limited coverage. Most tourist areas, hotels, dive sites and beaches have strong 4G or 5G.
Guam uses US-compatible LTE bands and 5G NR bands (Bands 2, 4, 5, 12, 66). All US-market iPhones work natively. Most international unlocked iPhones (XS and newer) and recent Android devices support the relevant bands. Guam uses 120V power with Type A and B (US-standard) sockets.
Data Usage Guide
Guam's 5G and 4G networks are fast enough for any data-intensive activity. The main preparation task is downloading offline content for areas with limited coverage: the Guam National Wildlife Refuge at Ritidian, deep jungle trails and ferry crossings to Cocos Island.
Download the National Park Service app and all War in the Pacific site offline maps in Tumon Bay before heading to central and south Guam sites. Talofofo Falls trail has 4G but caching the map is good practice.
Data by Activity
Light Use
5 GB
Tumon Bay beach and resort holiday (one week)
In-resort use with good Wi-Fi supplementing data needs. 5 GB covers daily navigation, social media, messaging and light streaming away from the resort.
Standard
8 GB
Island explorer (full Guam including south villages and WWII sites)
Moving across the island with regular navigation, downloading WWII site audio guides, dive booking and active social media posts from multiple locations.
Heavy Use
10 GB
Dive and outdoor adventure trip
Multiple dives at Blue Hole, Tumon Bay Reef and Crevice with dive log apps, weather apps, regular photo uploads from shore and evening streaming at the resort.
Apps & Internet Freedom
Guam has a fully open internet as a US territory. All apps including WhatsApp, Google, Instagram, FaceTime, YouTube, Netflix and X work normally on a Roamix eSIM without any restrictions.
Guam has no internet censorship. US First Amendment standards apply. All mainstream apps and streaming services are freely accessible.
Works fully. Widely used by international visitors and Filipino-American communities in Guam.
Google Maps
Works fully with excellent Guam data including dive sites, beaches and hiking trails.
FaceTime
Works fully over 5G and resort Wi-Fi.
Uber
Uber does not currently operate in Guam. Taxis and local rideshare services (iRide Guam) are available.
Netflix
Works fully. US Netflix catalogue available on US territory. 5G in Tumon Bay enables smooth 4K streaming.
iRide Guam
Local rideshare and taxi booking app for Guam. Download before arrival for airport and inter-island transfers.
National Park Service App
Essential for the War in the Pacific National Historical Park. Download park maps for WWII site navigation.
How to Set Up a Guam eSIM
Install and activate your Roamix Guam eSIM before leaving home. Guam is UTC+10, meaning early morning flights from Japan and Korea land before or at the start of local business hours. Having working data immediately is important for hotel check-in coordination and local transport.
All recent eSIM-compatible devices work in Guam. US-market iPhones have native compatibility with DoCoMo Pacific and IT&E bands. International unlocked iPhones (XS and newer) and most 2021 and later Android devices are compatible. Guam uses 120V/60Hz with Type A and B sockets.
- 1
Purchase a Roamix Guam eSIM plan at roamix.app and receive the QR code by email.
- 2
Go to Settings, then Cellular or Mobile Data, then Add eSIM, and scan the QR code.
- 3
Set the Roamix eSIM as your data line; keep your home SIM for calls and texts if needed.
- 4
Enable data roaming on the Roamix eSIM in your cellular settings.
- 5
On landing at Antonio B. Won Pat International Airport your eSIM connects to DoCoMo Pacific or IT&E automatically.
APN Note
APN is configured automatically by the Roamix profile. If data does not connect after landing, check Settings, Cellular, Cellular Data Network and confirm the APN matches your Roamix activation email.
Troubleshooting
If your eSIM does not connect, toggle Airplane Mode on and off. Go to Settings, Carrier and manually select DoCoMo Pacific or IT&E. Contact Roamix support via in-app chat for rapid assistance.
Get connected the moment you land in Guam.
Get your Guam eSIMArrival Checklist
Activate your Roamix Guam eSIM before departure so it connects to DoCoMo Pacific 5G or IT&E 4G on landing at Won Pat International Airport.
Download offline Google Maps tiles for Guam, including Tumon Bay, the south island, Talofofo and Ritidian Point.
Note the US emergency number: 911 for all emergencies in Guam.
Check US entry requirements: Guam has its own separate entry system (the Guam-CNMI Visa Waiver Program) that differs from the US mainland Visa Waiver Program (ESTA). Many countries eligible for Guam's own waiver are not on the US ESTA list and vice versa.
Bring a US-standard Type A or B plug adapter if arriving from Asia, Europe or Australia. Guam uses 120V, which may not charge some dual-voltage devices at full speed.
How locals communicate
Chamorros and the broader Guam community use standard American messaging apps: iMessage, FaceTime, WhatsApp and Facebook Messenger. Filipino-American residents (the largest community) heavily use Facebook and WhatsApp. Japanese tourists frequently use LINE. The tourist industry communicates primarily in English and Japanese.
Guam is a US territory: if you have a US phone plan that includes Puerto Rico and US territories, it may work in Guam. Check your carrier's specific territory coverage list. If not covered, a Roamix eSIM is the solution.
Airports in Guam
Antonio B. Won Pat International Airport
Tamuning / Hagatna
Free Wi-Fi available in the main terminal. Speeds are adequate for messaging and checking maps. International arrivals can be slow with multiple large aircraft arrivals from Japan.
Activate your Roamix Guam eSIM before departure for instant DoCoMo Pacific 5G on landing. The airport is in Tamuning, 5 minutes from Tumon Bay by taxi or hotel shuttle. Pre-arranged hotel shuttles are common from the major resorts.
Andersen Air Force Base Airfield
North Guam (Yigo)
Military installation; not open to civilian passengers.
Andersen AFB is a major US Air Force installation in north Guam, not accessible to civilian visitors. No commercial flights use UAM. Listed for completeness.
Rota International Airport
Rota, CNMI
Small regional airport serving the island of Rota in the Northern Mariana Islands. Basic facilities with no reliable public Wi-Fi.
Rota is the nearest island to Guam in the Commonwealth of the Northern Mariana Islands, a short flight north. United Airlines and local charters connect GUM to ROP. Note: CNMI uses the same calling code (+1-670) but is a separate US territory from Guam.
Saipan International Airport
Saipan, CNMI
Larger regional airport in the CNMI with free Wi-Fi. Served by multiple Asian carriers.
Saipan is the main island of the CNMI and is commonly paired with Guam on Japan-originating travel itineraries. A Roamix eSIM plan may or may not include CNMI; check your plan's coverage at roamix.app before travelling north.
Visa & Entry for Guam
Guam operates a separate Visa Waiver Program (the Guam-CNMI Visa Waiver Program, GCWVP) distinct from the US mainland ESTA. Nationals of Japan, South Korea, Australia, the UK, most EU countries, Canada, Taiwan, Hong Kong, and many others may enter Guam visa-free under GCWVP for up to 45 days. Some countries eligible for Guam entry are NOT eligible for ESTA. Entry to Guam does not confer the right to travel to the US mainland.
eVisa / ETA
Under the GCWVP, eligible nationals do not need to apply in advance. Bring a completed I-736 form (Guam-CNMI Visitor Permit), available on the flight. Check the US CBP website for the current list of GCWVP eligible countries.
Passport validity
Passport valid for at least 6 months beyond the intended stay is required.
Onward ticket
Onward or return ticket is required. Immigration officers at Won Pat Airport do verify this.
Download your hotel booking confirmation and return flight details offline before landing. Won Pat Airport immigration can be slow for large aircraft arrivals; working data for messaging your hotel while waiting is useful.
Guam entry requirements differ from US mainland requirements. Verify current GCWVP eligibility at the US Customs and Border Protection website (cbp.gov) before travel.
Get connected the moment you land in Guam.
Get your Guam eSIMMoney & Payments in Guam
Guam uses the US dollar (USD). No currency exchange is needed for US visitors. For international visitors the USD is the currency to bring or exchange before arrival. Major currencies (JPY, KRW, AUD) can be exchanged at the airport and at major hotels in Tumon Bay.
Cash vs Card
Visa, Mastercard and American Express are accepted everywhere in Tumon Bay: hotels, restaurants, duty-free shops and dive operators. Cash is useful for local restaurants in Hagatna, the Yigo and Inarajan village markets and small roadside food trucks. Contactless and Apple Pay are increasingly accepted at larger venues.
ATMs
Bank of Guam, First Bank of Guam and Bank of Hawaii ATMs are available throughout Tumon Bay and in major shopping centres. Airport ATMs charge fees; better rates at bank branch ATMs in Tumon Bay or Hagatna. Japanese yen and Korean won can be exchanged at DFS T Galleria and major hotel front desks.
Payment Apps
Apple Pay and Google Pay work at major retailers and hotels throughout Tumon Bay. Zelle and Venmo are used by American community members but not relevant for tourist transactions. DFS Galleria has its own shopping reward app for Japanese-market visitors.
Daily Budget
Guam has American pricing. Budget travellers at guesthouses and local plate lunch restaurants spend USD 80 to 120 per day. Mid-range visitors at Tumon Bay hotels with resort dining spend USD 200 to 350 per day. Luxury Westin, Marriott and Pacific Star Resort runs USD 300 to 600 per night. Duty-free shopping and dive trips are additional significant costs.
Data cost: Local data plans from IT&E and DoCoMo Pacific are US-priced (moderate to expensive by Pacific island standards). A Roamix eSIM offers convenient pre-purchase at competitive rates without needing to visit a carrier store.
Getting Around Guam
Guam has a car-centric infrastructure in the American style. A rental car is the most practical way to explore beyond Tumon Bay, particularly for the south island villages, Talofofo Falls, Ritidian Beach and WWII sites. The tourist Tumon Bay strip is walkable. Taxis are available at the airport and hotels. There is no public bus system practical for tourists.
Rental car
Essential for south Guam, Talofofo, Ritidian and WWII site exploration. Most major rental agencies have counters at Won Pat Airport. US driving licence accepted. Google Maps navigation works throughout Guam with offline map downloaded.
Taxi and iRide Guam
Taxis are available from the airport (taxi stand outside arrivals) and from major hotels. The iRide Guam app provides local rideshare service. Roamix data enables app booking from the terminal.
Hotel shuttle bus
Most Tumon Bay resort hotels run complimentary shuttles to the airport and to DFS T Galleria duty-free shopping. Limited to the Tumon Bay corridor. Check schedules with your hotel on arrival using Roamix data.
Island Hop Guam ferries
Ferries run from Merizo Pier to Cocos Island (a small uninhabited coral atoll off the south coast with a beach park). No signal on the crossing. Download Cocos Island map offline before boarding in Merizo.
Regions & Travel
Guam offers a compact but diverse travel experience: the resort-heavy Tumon Bay in the north, the historic and charming capital Hagatna, WWII battlefield sites throughout the island, pristine coral reefs for diving and snorkelling, southern coastal villages little changed in decades, and the sacred Chamorro cultural heritage of the island's indigenous people. The entire island is 50 kilometres long; you can drive from the northernmost tip to the southernmost point in under two hours.
Best time to visit: December to June is the dry season, with July to December being the rainy season and the period of tropical storm risk. January to April is the most popular and comfortable period: low humidity, consistent sunshine and the peak of Japanese and Korean resort tourism. The Christmas to New Year period is very busy. Typhoon risk is real from August to December; check JTWC (Joint Typhoon Warning Center) forecasts when planning travel in this window.
Tumon Bay and the Tourist Corridor
The heartbeat of Guam tourism. Tumon Bay is a crescent-shaped beach framed by luxury resort hotels, duty-free shopping malls (DFS T Galleria, Guam Premium Outlets), Japanese restaurants, dive shops and the famous Two Lovers Point cliff overlook to the north. The beach is calm, shallow and ideal for families. Most visitors to Guam stay within this corridor.
Signal: Best DoCoMo Pacific 5G in all of Guam. Ultra-fast speeds throughout Tumon Bay, the hotel strip and Two Lovers Point.
Hagatna (Agana) Capital Area
Guam's compact capital, Hagatna, centres on the Plaza de Espana, a shaded colonial plaza built during the Spanish colonial period. The Guam Museum, the ancient Chamorro Latte Stone Park, Dulce Nombre de Maria Cathedral Basilica and the waterfront Paseo de Susana park are all within a short walk. Hagatna also has the most concentrated collection of Spanish-era historic buildings in the Pacific.
Signal: Strong DoCoMo Pacific 5G and IT&E 4G throughout Hagatna. Good connectivity at all historic sites.
Central Guam and WWII Sites
The central plateau of Guam encompasses the main suburban areas of Dededo, Barrigada and Tamuning, as well as the War in the Pacific National Historical Park, which preserves significant WWII battle sites across the island. The Nimitz Hill memorial, Fonte Plateau (site of the 1944 Marine landing), Asan Beach Park and T. Stell Newman Visitor Center interpret the battle for Guam in July to August 1944.
Signal: IT&E and DoCoMo Pacific 4G in Dededo and Barrigada. WWII memorial sites have usable 4G. Download the National Park Service app offline in Hagatna before visiting.
South Guam (Inarajan, Umatac, Merizo)
The south of Guam is the most traditionally Chamorro part of the island, home to the historic villages of Inarajan (with preserved Spanish-era houses and natural swimming pools), Umatac Bay (where Magellan first landed in 1521), Merizo (departure point for Cocos Island) and Talofofo Falls in the interior. The coastal road from Hagatna south through these villages is one of the most scenic drives in the Pacific.
Signal: IT&E 4G in Inarajan, Umatac and Merizo villages. The coastal clifftop drives and some jungle interior areas have weaker signal. Download the south Guam map offline before heading south.
North Guam (Ritidian, Yigo, Dededo)
Northern Guam is dominated by Anderson Air Force Base and the Guam National Wildlife Refuge at Ritidian Point, where pristine limestone forest meets one of the finest undeveloped beaches on the island. Ritidian Beach requires a permit (available online from the USFWS) but rewards visitors with white sand, clear snorkelling water and zero crowds. Yigo is the largest village in Guam by population.
Signal: GTA and IT&E 4G in Yigo and Dededo. Ritidian Beach and the wildlife refuge interior have limited coverage. Download maps and the permit confirmation offline before heading north.
Hidden Gems
Blue Hole Dive Site
Dive SiteApra Harbour Area
Blue Hole is one of the world's premier blue-water dive sites: a 60-metre-diameter hole dropping to 100 plus metres below the reef surface near the mouth of Apra Harbour. The blue water column, abundant shark sightings, resident sea turtles and dramatic underwater architecture make it a bucket-list dive.
Signal: DoCoMo 4G at the dive boat departure points in Apra Harbour and Piti. No signal underwater. Download dive site charts and depth profiles offline with your dive log app before boarding.
Book Blue Hole dive trips with Fish Eye Marine Park, Piti Dive Company or other Guam operators using Roamix data. Download your dive site briefing from the operator website offline the evening before.
Two Lovers Point (Puntan Dos Amantes)
Scenic ViewpointTumon Bay North
A dramatic 120-metre limestone cliff overlook named after a legend of two Chamorro lovers who tied their hair together and leaped rather than be separated. A heart-shaped pathway, observation deck, and views over the entire Tumon Bay make it one of the most photographed points in the Pacific.
Signal: Excellent DoCoMo 5G signal at Two Lovers Point. High ground and open clifftop for maximum signal.
Two Lovers Point is the most-photographed spot in Guam. 5G connectivity enables instant high-res uploads to social media. The site is 3 kilometres from central Tumon Bay.
Talofofo Falls
Waterfall ParkTalofofo, South Guam
Guam's best-known waterfall, accessible by cable car into the jungle gorge. The park includes a small cable car ride, suspension bridges, jungle pools and the Japan House museum. The nearby Talofofo Bay is historically significant as where Japanese soldier Hiroo Onoda held out until 1972, not knowing WWII had ended.
Signal: IT&E 4G in Talofofo village and at the falls parking area. Cable car to the falls bottom has IT&E signal. Download the falls trail map offline from Hagatna before driving south.
Book Talofofo Falls cable car tickets online before driving south using Roamix data. IT&E 4G covers the park entrance and cable car area.
War in the Pacific National Historical Park
WWII Heritage SiteMultiple sites across Guam
One of the most historically significant WWII sites in the Pacific. The park preserves seven separate units across Guam commemorating the battles of 1941 (Japanese invasion) and 1944 (American liberation). Asan Beach is where US Marines landed on July 21, 1944. Liberation Day remains Guam's national holiday.
Signal: IT&E and DoCoMo 4G at Asan Beach Visitor Center and main park areas. Download the NPS app with offline site maps in Hagatna before visiting remote battlefield areas.
Download the full War in the Pacific NPS app with offline audio guides before visiting. Multiple battle sites across the island require navigation. Use Roamix data to coordinate site visits across the island.
Ritidian Beach (Guam National Wildlife Refuge)
Protected BeachNorth Guam
The most pristine and undeveloped beach on Guam. A long white-sand beach at the base of limestone cliffs with excellent snorkelling, sea turtle nesting and no commercial development. Access requires a free advance permit from the USFWS.
Signal: Very limited signal at Ritidian Beach. GTA 4G in Yigo; signal drops on the road north to the refuge. Download the refuge map and your permit confirmation offline before heading north.
Apply for the Ritidian Beach permit online at the USFWS website using Roamix data. Download the permit PDF and refuge map offline before departing Tumon Bay for the 40-minute drive north.
Cocos Island
Uninhabited Coral AtollOff Merizo, South Guam
A small uninhabited atoll 2 kilometres off the south tip of Guam, accessible by ferry from Merizo Pier. A beach park with snorkelling, kayaking, a floating water park and picnic facilities. The surrounding lagoon is a protected marine reserve with excellent coral and reef fish.
Signal: No mobile coverage on Cocos Island. IT&E 4G at Merizo Pier before the ferry. Download Cocos Island map and snorkel site guide offline before boarding.
Book Cocos Island ferries from Merizo Pier using Roamix data. Download the island map offline. Return ferry times are fixed; missing the last ferry requires arranging emergency pickup by phone from Merizo.
Inarajan Natural Pool
Natural Swimming PoolInarajan, South Guam
A series of natural volcanic rock pools at the edge of the village of Inarajan, protected from the open ocean by a natural reef and cliff barrier. The pools are calm, clear and safe for swimming. Inarajan itself is one of the best-preserved Spanish colonial-style villages in Guam.
Signal: IT&E 4G in Inarajan village. The natural pool at the shoreline has mobile signal.
Navigate to Inarajan using Google Maps south coast route with offline tiles cached in Hagatna. The natural pool is signposted from the Inarajan Village Plaza.
Chamorro Village Night Market
Cultural MarketHagatna
Every Wednesday evening the Chamorro Village waterfront comes alive with local food vendors, artisans, live traditional Chamorro music and dance, and a genuine cross-section of Guam's multicultural community. The best single experience for food and cultural immersion in Guam. Essential for trying kelaguen, red rice, pancit and finadene sauce.
Signal: DoCoMo 5G and IT&E 4G at the Paseo de Susana in Hagatna where the market is held.
Navigate to the Chamorro Village on Wednesday evening using Google Maps or iRide Guam. Parking can be scarce; consider a taxi from Tumon Bay using Roamix data to book in advance.
Umatac Bay
Historic Site and BayUmatac, South Guam
The bay where Ferdinand Magellan made his first Pacific landfall in March 1521, becoming the first European to arrive in the Marianas. The annual MagellanFest in March commemorates the landing. The village retains a very traditional Chamorro character with a Spanish-era fort ruin and church. The bay view is arguably Guam's most dramatic natural scenery.
Signal: IT&E 3G to 4G in Umatac village. The bay overlook and San Dionisio Church ruins have outdoor signal.
Umatac is 30 kilometres south of Hagatna on a scenic coastal road. Navigate with offline maps cached from Hagatna. IT&E 4G covers the village; the clifftop drive south of Umatac can lose signal.
Fish Eye Marine Park Underwater Observatory
Marine AttractionPiti Bay, Central West Guam
An underwater observatory extending 9 metres below the surface of Piti Bay, giving non-divers a window into Guam's reef ecosystem from inside a glass-walled chamber. Surrounding reef dives are also available. One of the most accessible marine experiences in the Pacific for non-divers.
Signal: DoCoMo and IT&E 4G at the Fish Eye Marine Park entrance and pier. The underwater observatory chamber is signal-dependent on above-water relay.
Book Fish Eye Marine Park observatory tickets and glass-bottom boat tours online using Roamix data. The park is on the west coast road from Hagatna; navigate with Google Maps.
Events & Best Seasons
Liberation Day
National Holiday and ParadeHagatna and Tumon Bay · July 21
Guam Liberation Day commemorates the American liberation of Guam from Japanese occupation on July 21, 1944. The largest public event in Guam, featuring a military parade through Hagatna, fireworks over Tumon Bay, a Liberation Day Carnival and village fiestas across the island. The most important day on the Guam calendar.
Network note
Full DoCoMo 5G and IT&E 4G across Hagatna and Tumon Bay during Liberation Day celebrations.
Roamix tip
Liberation Day coincides with the best time of the Guam summer dry season. Hotels in Tumon Bay book up; reserve well in advance. Use Roamix data to navigate the parade route and find viewing spots.
Guam Micronesia Island Fair
Cultural FestivalUniversity of Guam Field House, Mangilao · May
An annual festival celebrating the traditional cultures of Micronesia: Guam, the Northern Marianas, Palau, Yap, Chuuk, Pohnpei, Kosrae and the Marshall Islands. Traditional crafts, food, dance, navigation demonstrations and canoe racing bring together the island cultures of the Pacific in one extraordinary gathering.
Network note
IT&E and DoCoMo 4G at the University of Guam field house in Mangilao.
Roamix tip
The Micronesia Island Fair is the best window into the traditional Chamorro and Micronesian cultural heritage beyond the tourist Tumon Bay experience. Navigate from Tumon Bay to Mangilao using Roamix data.
MagellanFest
Cultural and Historical FestivalUmatac, South Guam · March
An annual festival in the village of Umatac commemorating Ferdinand Magellan's landing in Guam in March 1521, historically the first European contact with Micronesia. Features a reenactment of the landing, Chamorro cultural performances, traditional food, and the annual Miss Umatac Bay pageant.
Network note
IT&E 3G to 4G in Umatac for the festival. Signal may be congested during the main landing reenactment on the beach.
Roamix tip
Drive south from Hagatna (45 minutes) for MagellanFest in March. Download the Umatac map offline before the drive. Parking is limited; arrive early.
Guam International Shooting Sports Federation World Cup
Sporting EventGuam Olympic Shooting Range · Varies (typically late year)
Guam hosts international shooting sports events as part of the ISSF World Cup circuit, drawing Olympic-level competitors from across Asia and the Pacific. Guam's shooting programme has produced Olympic qualifiers and is a point of local sporting pride.
Network note
DoCoMo 4G at the Guam Olympic Shooting Range facility.
Roamix tip
Check the ISSF calendar for Guam events using Roamix data. Shooting sports in Guam draw a dedicated international athletics tourism segment.
Guam Ko'ko' Road Races
Running EventVarious courses, Guam · Multiple events year-round
Named after the endangered flightless Guam rail bird (ko'ko'), the Guam Ko'ko' Road Races series features multiple running events throughout the year including a half marathon, 10K and 5K. Courses showcase Guam's coastal and jungle scenery and the events draw participants from the military and civilian community.
Network note
Coverage varies by course location. DoCoMo 4G on Tumon Bay sections; IT&E on south island sections.
Roamix tip
Check the Guam Road Runners Association website for the Ko'ko' Race series calendar using Roamix data. Races are open to tourists visiting Guam.
Festival of Pacific Arts
Cultural FestivalGuam (hosted periodically) · Varies (multi-year cycle)
The Festival of Pacific Arts (FestPAC) is the premier cultural gathering of Pacific nations, rotating hosting between Pacific territories and nations every four years. Guam has hosted FestPAC twice. When in Guam, the event brings together over 25 Pacific nations for traditional arts, dance, navigation and craft for a two-week celebration.
Network note
Full DoCoMo 5G and IT&E 4G at FestPAC venues when hosted in Guam.
Roamix tip
FestPAC is held every four years across Pacific host nations. Monitor the Secretariat of the Pacific Community for the next host announcement. Check using Roamix data.
Guam Visitors Bureau Food and Culture Festival
Food FestivalHagatna and Tumon Bay · November
An annual celebration of Chamorro cuisine and island culture organised by the Guam Visitors Bureau. Features traditional kelaguen, red rice, pancit and barbecue cooking demonstrations, Chamorro craft vendors and live dance and music performances.
Network note
Full 5G and 4G throughout Hagatna and Tumon Bay festival venues.
Roamix tip
Check the GVB website for event dates and locations using Roamix data. November falls in the early rainy season but events are typically held indoors or in covered outdoor venues.
Guam BBQ Block Party
Food and Cultural EventHagatna Waterfront · September
A popular outdoor barbecue and music event celebrating Guam's outdoor grilling and fiesta culture on the Hagatna waterfront. Local restaurants, food trucks and home cooks compete and sell traditional Chamorro barbecue dishes alongside live local music. A signature community event of the Guam summer season.
Network note
Full DoCoMo 5G and IT&E 4G at the Hagatna waterfront Paseo de Susana.
Roamix tip
Navigate to the Hagatna waterfront using Roamix data. The BBQ Block Party coincides with the end of Guam's rainy season; September weather can include afternoon showers.
Guam Marathon
Sporting EventTumon Bay and coastal roads · March
An international marathon drawing runners primarily from Japan, South Korea and the US mainland who combine the race with a Guam beach holiday. The course covers the Tumon Bay resort strip and portions of the scenic coastal highway. A signature Pacific destination race event.
Network note
Full DoCoMo 5G along Tumon Bay marathon course sections. IT&E 4G on outer course sections.
Roamix tip
Register for the Guam Marathon well in advance through the official event website. Book Tumon Bay resort accommodation early as marathon week coincides with peak Japan travel season.
Halloween in Tumon Bay
Seasonal EventTumon Bay Street · October 31
As a US territory, Guam observes Halloween with significant enthusiasm. Tumon Bay's main strip transforms into a costume parade, with hotels and stores competing for the most elaborate decorations. The Chamorro Village holds a Halloween market. A colourful cultural snapshot of Guam's American-Pacific hybrid identity.
Network note
Full DoCoMo 5G throughout Tumon Bay on Halloween night. High social media activity.
Roamix tip
Tumon Bay on Halloween is lively and photogenic. Upload your costume content instantly to social media using DoCoMo 5G via Roamix eSIM.
Spring
April to June is a pleasant shoulder period: dry season extending into May, with June bringing the first humidity of the new rainy season. Good value accommodation. The Micronesia Island Fair in May is a highlight. Dive visibility is excellent in April and May with the clearest water of the year.
Summer
July to September is the heart of Guam's rainy season and typhoon risk period. Humidity is at its highest and afternoon tropical downpours are daily. The Japanese school summer holiday (July to August) coincides, making Tumon Bay very busy with Japanese family tourists despite the weather. July 21 Liberation Day is the biggest holiday. Typhoon risk is real; monitor JTWC forecasts.
Fall
October to November sees the rainy season tapering. Humidity begins to drop by November. Typhoon risk recedes after October. Hotels offer better rates as Japanese school holiday season has ended. The Guam BBQ Block Party in September and food festivals in November provide cultural engagement.
Winter
December to March is dry season and peak tourism. Humidity drops, temperatures are 24 to 28 degrees Celsius, and the island is at its most comfortable. December and January are the busiest months with Japanese and Korean New Year travellers. The Guam Marathon in March and MagellanFest also draw visitors. Book well in advance for this period.
Remote Work from Guam
Guam is a viable remote work destination thanks to US standards, English language, fast DoCoMo Pacific 5G in Tumon Bay and comfortable resort infrastructure. The ChST timezone (UTC+10) aligns well with East Asian business hours and reasonably with Australian time zones.
DoCoMo Pacific 5G in Tumon Bay delivers speeds far exceeding what most professional remote workers need. Tumon Bay hotel business centres and some cafes offer co-working-style environments.
The Guam digital nomad scene is small but growing. The Hilton and Marriott in Tumon Bay have business centres with fast Wi-Fi and printer access. The Tumon Bay resort strip cafes and the Chamorro Village area offer informal work-from-cafe options. For calls to Asia, the UTC+10 timezone lines up exactly with Japan, Philippines and Australia Eastern time during standard hours.
Get connected the moment you land in Guam.
Get your Guam eSIMLocal Tips for Guam
Language
English is the official language and lingua franca of all commerce, government and tourism in Guam. Chamorro, the indigenous language of the Chamorro people, is co-official and taught in schools. Japanese is widely spoken in Tumon Bay due to the dominant Japanese tourist market. Filipino languages (Tagalog, Ilocano) are spoken by the large Filipino-American community.
Tipping
Guam follows US tipping norms. Restaurant service: 15 to 20 percent. Taxi drivers: 10 to 15 percent round-up. Hotel housekeeping: USD 2 to 5 per day. Dive guides: USD 10 to 20 per dive or day trip. Duty-free shopping staff do not expect tips.
Food & Dining
Chamorro cuisine is distinctive and deeply local: kelaguen (marinated raw or grilled chicken or beef with lemon, coconut and hot peppers), red rice (coloured with achote seeds and traditionally served at every feast), pancit (Filipino-influenced noodle dish), empanada (meat-filled pastry from Spanish influence), and the ubiquitous plate lunch of rice, barbecue chicken and finadene sauce (Chamorro hot sauce). The Chamorro Village Night Market in Hagatna every Wednesday night is the best food experience in Guam. Japanese and Korean restaurant options in Tumon Bay are excellent and numerous.
Transport
Rent a car at Won Pat Airport for any travel beyond Tumon Bay. The south island route via Hagatna, Inarajan, Umatac and Merizo is one of the best Pacific island drives and takes about 3 hours including stops. Taxis in Tumon Bay are metered; agree rates before longer journeys.
Emergency Numbers
general
911
police
911
ambulance
911
fire
911
Essential Apps
iRide Guam
Local rideshare app for Guam. Use for airport transfers, Tumon Bay to Hagatna trips and when you prefer not to drive.
Scubaboard / DiveAdvisor
Dive site reference apps covering Guam's Blue Hole, Crevice and Tumon Bay reef sites. Download site briefings offline before each dive.
National Park Service
Official NPS app with offline maps and audio guides for the War in the Pacific National Historical Park battle sites including Asan Beach, Fonte Plateau and Nimitz Hill.
Safety & Health in Guam
Guam is generally safe for tourists with US levels of public safety infrastructure. Petty theft can occur in crowded tourist areas in Tumon Bay. The main environmental risks are typhoons (August to December), rip currents on open ocean beaches, and the sun (UV index is extreme in Guam). Ocean swimming at Gun Beach and Tumon Bay is generally safe; Ritidian Beach on the north coast can have stronger surf.
Keep your Roamix eSIM active when driving south Guam's coastal roads, hiking Talofofo or visiting Ritidian Beach in the north. Signal coverage is thinner in these areas, so cache offline maps before departure from Tumon Bay and ensure your emergency 911 is accessible.
Health Note
Guam operates under US healthcare standards. Guam Memorial Hospital in Tamuning and Naval Hospital Guam (military, limited civilian access) are the main facilities. Travel insurance is strongly recommended for non-US visitors, as healthcare costs in Guam match US pricing.
Water Safety
Tap water in Guam is treated and safe to drink throughout the island. The Guam Waterworks Authority maintains treated water supply. Bottled water is widely available and commonly served at resorts.
Frequently Asked Questions
Guam eSIM, connectivity, and travel
Do I need an eSIM or local SIM for Guam?
Either works in Guam. A Roamix eSIM is more convenient: you activate it before departure, it connects to DoCoMo Pacific 5G or IT&E 4G on landing, and you avoid the carrier store visit in Tumon Bay. Physical SIMs from IT&E and DoCoMo Pacific are available in the Micronesia Mall and Tumon Bay stores.
Which mobile network is best in Guam?
DoCoMo Pacific is the technology leader with the fastest 5G in Tumon Bay and central Guam. IT&E has the widest overall coverage including southern villages, Inarajan, Umatac and Merizo. For most tourist itineraries, DoCoMo Pacific delivers the best experience.
How do I set up a Roamix eSIM for Guam?
Purchase a plan at roamix.app, scan the QR code in your phone eSIM settings (Settings, Cellular, Add eSIM), set Roamix as your data line and enable data roaming. Your eSIM connects to DoCoMo Pacific or IT&E automatically on landing at Won Pat International Airport.
Does my US phone plan work in Guam?
Some US domestic carrier plans include Guam. T-Mobile US domestic plans typically cover Guam at no extra charge. AT&T and Verizon have territory coverage for Guam under some plans. Check your specific plan's terms before travel. If not covered, a Roamix eSIM or a local Guam SIM is the solution.
Is Guam part of the US?
Guam is an unincorporated US territory, meaning it is under US sovereignty but is not a US state. US citizens are born in Guam but cannot vote in US presidential elections unless they live on the mainland. Guam uses the US dollar, US laws, US emergency number 911 and American standards throughout.
Do I need a visa to enter Guam?
Guam has its own Guam-CNMI Visa Waiver Program (GCWVP) separate from the US mainland ESTA. Japanese, Korean, Australian, UK, most EU, Canadian and Taiwanese nationals among others can enter visa-free under GCWVP for up to 45 days. Entry to Guam does not allow travel to the US mainland. Check the full GCWVP eligibility list at cbp.gov.
What currency is used in Guam?
Guam uses the US dollar (USD). No currency exchange is needed for US visitors. Japanese yen and Korean won can be exchanged at the airport and at major Tumon Bay hotels and DFS T Galleria. Cards (Visa, Mastercard, Amex) are accepted everywhere.
What is the best time to visit Guam?
December to March is the dry season and peak season with the best weather: 24 to 28 degrees Celsius, low humidity and no typhoon risk. January and February are ideal. The rainy and typhoon season runs July to November. Liberation Day on July 21 is the biggest local event and draws visitors despite the rainy season.
What is the Blue Hole dive site in Guam?
Blue Hole is a world-famous dive site near Apra Harbour: a 60-metre-diameter opening in the reef dropping into a vertical blue water column. It is known for shark sightings, sea turtles and extraordinary underwater scenery. Advanced divers only due to depth. Book with local Guam dive operators using Roamix data before departure.
Is it safe to visit south Guam?
Yes. South Guam's villages (Inarajan, Umatac, Merizo) are genuinely safe and among the most rewarding parts of the island for cultural and scenic travel. Roads are narrow and winding; drive carefully on the coastal cliff roads. IT&E 4G covers the main villages but some remote stretches have weaker signal, so cache offline maps before heading south.
What is Liberation Day in Guam?
Liberation Day on July 21 is Guam's most important public holiday, commemorating the American liberation of Guam from Japanese occupation on July 21, 1944 after 32 months of occupation. It features a large military parade through Hagatna, fireworks over Tumon Bay and village fiestas across the island.
Does Guam have 5G?
Yes. DoCoMo Pacific launched Guam's first 5G network in 2020, making Guam the first Pacific island territory with 5G. The network covers Tumon Bay, Tamuning and central Hagatna with speeds of 150 to 600 Mbps. IT&E and GTA TeleGuam offer 4G coverage across the rest of the island.
What emergency number should I use in Guam?
911 is the universal emergency number in Guam for police, ambulance and fire, the same as the US mainland. It works from any mobile network including a Roamix eSIM.
Is internet access censored in Guam?
No. Guam has a fully open internet with US First Amendment standards applying. All apps including Netflix, YouTube, Instagram, FaceTime, WhatsApp and X work without restrictions.
Still have questions?
Visit Help CenterNo roaming fees. Ever.
Land in Guam connected, not searching for a SIM
A Roamix Guam eSIM connects you to DoCoMo Pacific 5G the moment you land at Won Pat International. No carrier counter queues. Just Tumon Bay, Two Lovers Point and the Pacific in front of you.