Southeast AsiaHanoiVietnam eSIM and Travel Guide: Stay Connected From Hanoi to Ho Chi Minh City
Vietnam has excellent mobile coverage in cities and along the tourist corridor, with fast 4G everywhere from Hanoi's Old Quarter to Hoi An's lantern streets. Viettel has the widest rural and highland coverage. A Roamix Vietnam eSIM activates on arrival in Hanoi or Ho Chi Minh City with no local registration. Budget 6 to 10 GB for a two-week north-to-south trip.
Key Takeaways
- Viettel has the widest coverage including rural highlands, Sapa and the Mekong Delta. Essential for off-the-beaten-track travel.
- A Roamix eSIM activates automatically on arrival and avoids the airport SIM queue, which can be lengthy at Noi Bai and Tan Son Nhat.
- Cash is essential throughout Vietnam, especially outside major cities and tourist areas.
- Vietnam e-visas are now available to nationals of all countries and are applied for online before arrival.
- Budget 6 to 10 GB for two weeks of navigation, social sharing and WhatsApp with local contacts.
Quick Facts
Vietnam Connectivity
Get a Roamix Vietnam eSIM and land in Hanoi or Ho Chi Minh City already connected.
How to Stay Connected in Vietnam
Vietnam has wifi in almost every cafe, hotel and guesthouse, but quality varies enormously. Hanoi and Ho Chi Minh City cafes often have fast connections. Remote guesthouses and homestays in Sa Pa or Ha Giang may have very slow or no wifi.
Option
Best For
Notes
RecommendedRoamix eSIM
Most travellers, especially those covering the full country
Activates on arrival, covers north to south on Viettel, no registration hassle and no physical SIM swap.
Local physical SIM
Long stays or those needing a local Vietnamese number
Very cheap data but requires a passport check and SIM swap at an airport counter or carrier store.
Pocket wifi
Groups sharing one device
Available for rent in Hanoi and Ho Chi Minh City but adds another device to charge and return.
Carrier roaming
Very short layovers
Expensive and often limited compared to what local 5G networks deliver on a Roamix plan.
For most Vietnam visitors, a Roamix eSIM on the Viettel network is the most practical option, combining the widest geographic coverage with zero registration requirements.
Get connected the moment you land in Vietnam.
Get your Vietnam eSIMMobile Networks in Vietnam
Vietnam's mobile networks have expanded rapidly, with Viettel, Vinaphone and Mobifone all launching commercial 5G services by 2025. Coverage in Hanoi, Ho Chi Minh City, Da Nang and the main tourist corridor is strong. Viettel dominates for rural and highland coverage, reaching remote areas of the north and the Mekong Delta that the other operators miss. A Roamix Vietnam eSIM connects to the best available network on arrival, with no registration process.
By far the widest geographic reach in Vietnam, covering over 95% of the land area including remote northern highlands, Ha Giang, Sapa mountain roads, Mekong Delta villages and coastal islands. Leads on both 5G availability and rural coverage.
Strong in Hanoi, Ho Chi Minh City and major provincial capitals. Offers some of the fastest urban speeds and was the second operator to launch commercial 5G in December 2024.
Good urban coverage in major cities with a focus on Ho Chi Minh City and central Vietnam. 5G expanding from city centres. Less reliable outside the top ten cities.
Typical Speeds
Expect 20 to 80 Mbps on 4G in tourist areas and 200 to 450 Mbps on 5G in major cities. Viettel reached an average 5G download of around 617 Mbps in January 2026.
5G Status
Viettel leads with 30,000 5G stations and 90% outdoor population coverage by end 2025. Vinaphone and Mobifone are rapidly expanding their 5G footprints in cities and provincial centres.
For trips that include Sapa, Ha Giang or any northern highland region, Viettel coverage is the only reliable option. A Roamix plan on the Viettel network gives you the best chance of staying connected in Vietnam's most spectacular remote landscapes.
Remote northern highland areas like Ha Giang loop roads and deep Phong Nha cave systems can have patchy or no signal on any network. Ha Long Bay boat trips often go offline in open water. Download offline maps and entertainment before departing.
Vietnamese networks use widely supported 4G LTE and 5G mid-band frequencies that work with most modern unlocked smartphones.
Data Usage Guide
Vietnam trips require steady data for Grab, Google Maps, hotel and tour WhatsApp communication and navigating a language where even menus can be challenging without a translation app.
Download offline Google Maps for Ha Long Bay, Ha Giang and any area where you plan to take a cruise or drive into the highlands, as signal is unreliable on open water and mountain roads.
Data by Activity
Light Use
4 to 6 GB
One week in Hanoi and Ha Long Bay
Grab, Google Maps, WhatsApp with tour operators and daily photo sharing.
Standard
6 to 10 GB
Two-week north-to-south journey
Navigation across multiple regions, flight and train bookings, WhatsApp and social sharing throughout.
Heavy Use
15 GB or more
Remote work or extended stay
Video calls, laptop tethering and cloud uploads alongside daily exploration.
Apps & Internet Freedom
Vietnam has an open internet for all mainstream apps. Every common travel and social media app works normally on a Roamix Vietnam eSIM.
There is no general blocking of messaging, social media or calling apps for tourists. Some politically sensitive websites and international news sources may be filtered, but this does not affect travel apps. No VPN is needed for everyday use.
Fully available and useful for communicating with hotels, drivers and tour operators.
Facebook and Messenger
Facebook is widely used in Vietnam and Messenger calls work normally on a Roamix eSIM.
Google Maps
Unrestricted and essential for navigating Vietnam's cities and rural roads.
Grab
The dominant ride-hailing app in Vietnam, works normally and is essential for safe and priced rides in Hanoi and Ho Chi Minh City.
How to Set Up a Vietnam eSIM
A Roamix Vietnam eSIM installs over wifi before departure and connects automatically to Viettel or another local carrier on arrival at Noi Bai or Tan Son Nhat, with no counter visit or paperwork required.
Works on eSIM capable phones including iPhone XS and newer, Google Pixel 3 and newer, and recent Samsung Galaxy models. The phone must be carrier unlocked.
- 1
Buy your plan on the Roamix Vietnam eSIM page before your trip.
- 2
Install the eSIM over wifi by scanning the QR code.
- 3
Label it Roamix and keep your home SIM for calls and SMS.
- 4
Enable data roaming on the Roamix line only.
- 5
Land in Vietnam and the eSIM connects automatically. Open Grab to book your first ride before you reach the exit.
APN Note
Roamix configures the APN automatically on most devices. If data does not start, apply the APN from your activation email and toggle airplane mode.
Troubleshooting
If no data on arrival, confirm data roaming is enabled for the Roamix line, try selecting the network manually and restart the phone.
Get connected the moment you land in Vietnam.
Get your Vietnam eSIMArrival Checklist
Confirm your Roamix eSIM is connected before leaving arrivals at Noi Bai (Hanoi) or Tan Son Nhat (Ho Chi Minh City).
Download Grab before landing. It is the dominant rideshare app in Vietnam and will save you from motorbike taxi hustlers and overcharging at the arrivals exit.
Withdraw Vietnamese dong at an airport ATM. Cash is essential for street food, local buses, motorbike hire and smaller hotels.
Download offline Google Maps for the regions you plan to visit. Ha Long Bay cruises and Ha Giang highland roads frequently go out of signal.
Have your e-visa approval printed or clearly displayed on your Roamix-connected phone for immigration.
How locals communicate
Facebook Messenger is the dominant messaging platform in Vietnam, used widely for both personal and business communication. WhatsApp and Zalo (a Vietnamese messaging app) are also commonly used.
Install Zalo before arriving if you plan to communicate extensively with local guides, drivers and smaller guesthouses that may not use WhatsApp.
Airports in Vietnam
Tan Son Nhat International Airport
Ho Chi Minh City
Free wifi available throughout the terminal but requires phone number verification via SMS, which is unreliable without a working SIM.
SGN is Vietnam's busiest airport and SIM kiosk queues in arrivals can run 20 to 30 minutes during peak times. A Roamix eSIM connects immediately on Viettel 5G as you step off the jet bridge, before you reach immigration.
Noi Bai International Airport
Hanoi
Free wifi available in the international terminal. Coverage is reasonable in the arrivals hall.
Noi Bai is 45 km north of Hanoi's Old Quarter. Having Roamix data active means you can book a Grab and set your hotel as a pin before you exit arrivals, avoiding the unmetered taxi queue entirely.
Da Nang International Airport
Da Nang
Free wifi offered in the terminal. Da Nang is a smaller airport and wifi is generally accessible without congestion.
Da Nang sits 30 minutes from Hoi An and 1 hour from Hue. Roamix data is immediately useful for loading Hoi An restaurant reservations and the Hue palace entry schedule the moment you land.
Phu Quoc International Airport
Phu Quoc
Wifi available in the terminal. Phu Quoc is a resort island so arrivals are often international leisure travellers.
Phu Quoc is Vietnam's resort island, and hotel shuttles, motorbike rentals and tour operators all communicate via messaging apps. Roamix on Viettel connects immediately and keeps you coordinated from the arrivals gate.
Visa & Entry for Vietnam
Vietnam offers an e-visa to nationals of all countries, valid for up to 90 days and applied for online through the official Vietnam e-Visa portal. Citizens of 29 countries also receive visa-free entry for 14 to 45 days, including Germany, France, UK, Japan and South Korea at 45 days, and ASEAN countries at 30 days.
eVisa / ETA
Apply for a Vietnam e-visa at the official evisa.gov.vn portal before arrival. The e-visa costs around USD 25 and is processed within 3 working days. All nationalities are now eligible for the e-visa.
Passport validity
Your passport must be valid for at least 6 months from the date of arrival.
Onward ticket
Proof of onward travel is required at immigration and may be checked by airlines at check-in.
Keep your e-visa confirmation accessible on your Roamix-connected phone. Some immigration desks request a printed copy, so save it offline before arriving.
Visa rules change. Always confirm current requirements at the official Vietnamese immigration portal before booking.
Get connected the moment you land in Vietnam.
Get your Vietnam eSIMMoney & Payments in Vietnam
The Vietnamese dong is a cash-forward currency. One US dollar is around 25,000 VND, and amounts in the millions are common for everyday purchases. Keep enough cash for street food, local transport and markets.
Cash vs Card
International cards are accepted at upscale hotels, major restaurants and larger shops in tourist areas. For everything else, cash is king. ATMs are common in Hanoi and Ho Chi Minh City but rarer in smaller towns and islands.
ATMs
Withdraw cash in larger amounts (3 to 5 million VND) to minimise ATM fees. Always choose to be charged in VND to avoid dynamic conversion fees.
Payment Apps
MoMo is the dominant Vietnamese digital wallet but requires local bank verification. Some tourist-facing restaurants and cafes accept international payment apps via QR. A connected Roamix eSIM keeps your banking app active for tracking spending and finding ATMs.
Daily Budget
Budget travellers can manage on 300,000 to 600,000 VND a day for local food, guesthouses and transport. Mid-range travellers spend 800,000 to 2,000,000 VND. Vietnam is still one of Southeast Asia's best-value destinations.
Data cost: Carrier roaming in Vietnam is expensive relative to local prices. A Roamix eSIM covers a full two-week trip for a fraction of daily roaming charges.
Getting Around Vietnam
Vietnam's transport reflects its long, thin geography. The country is best explored by a combination of domestic flights, overnight trains, Grab in cities and motorbike hire or local bus for shorter regional stretches.
Grab
Essential in Hanoi and Ho Chi Minh City for safe, price-fixed rides. Open Grab before leaving arrivals to have a car ready before reaching the taxi queue.
Domestic flights
The most practical way to cover the full length of Vietnam. Vietnam Airlines, Bamboo Airways and VietJet operate frequent routes. A Roamix eSIM manages mobile boarding passes and live departure info.
Overnight trains (Reunification Express)
The iconic way to travel between Hanoi and Ho Chi Minh City, passing Hue, Da Nang and Nha Trang. Signal is present in cities and coastal sections but drops in tunnels and rural areas.
Motorbike hire
The most common way to explore Hoi An, Hue and rural areas independently. Use Google Maps offline and a phone mount for navigation on unfamiliar roads.
Regions & Travel
Vietnam stretches over 1,600 kilometres from north to south, offering an extraordinary diversity of landscapes, cuisines and cultural experiences across three very distinct regions. From the mountain terraces of the north to the lantern-lit streets of Hoi An and the Mekong Delta river life, staying connected makes the journey between these worlds seamless.
Best time to visit: February to April is generally good for central and southern Vietnam. October to March suits the north. The central coast is best from February to August. Given the length of the country, check the regional forecast for wherever you are going.
Hanoi and the North
Vietnam's capital is a city of tree-lined French colonial boulevards and street food that fills every pavement, and the gateway to the terraced rice fields of Sapa and the dramatic karst valleys of Ha Giang. The Ha Giang loop, Dong Van Karst Plateau and Ba Be National Park are all within reach of Hanoi.
Signal: Excellent 5G across Hanoi's Hoan Kiem, Ba Dinh and Cau Giay districts. Sapa town has reliable Viettel 4G. Ha Giang loop towns have basic 4G; mountain passes between them are intermittent. Download offline maps for the full Ha Giang loop before departing Ha Giang city.
Ha Long Bay and Northeast Coast
Ha Long Bay's 1,600 limestone islands rising from emerald water is one of the great natural spectacles of Southeast Asia. Nearby Cat Ba Island adds beach, hiking and a fishing village atmosphere distinct from the main bay.
Signal: Viettel 4G throughout Ha Long city and Cat Ba town. Cruise boats within 15 km of shore have usable signal. Outer anchorages on overnight cruises can drop to weak 3G or no signal. Pre-download offline maps and travel documents before boarding.
Central Vietnam: Hue, Da Nang, Hoi An
The most culturally dense corridor in Vietnam. Hue's imperial citadel, the ancient trading town of Hoi An with its full-moon lantern festivals, Da Nang's beachfront, Ba Na Hills and My Son Sanctuary together form a compelling three-city itinerary.
Signal: Strong Viettel 5G in Da Nang city and along My Khe Beach. Hue city centre and Hoi An Old Town have reliable 4G. Ba Na Hills has Viettel coverage throughout. My Son Sanctuary outer clusters may have weak signal.
Ho Chi Minh City and the South
Vietnam's largest city is a relentless engine of commerce, coffee culture and street food. The nearby Mekong Delta offers slow boat rides through water hyacinth channels and floating markets at Can Tho. Con Dao Islands provide a pristine escape for those who travel further.
Signal: Dense Viettel 5G across Districts 1, 3 and 7. Can Tho in the Mekong Delta has 5G. Rural delta villages and outer Mekong channels have viettel 4G; MobiFone and Vinaphone thin out. Con Son island on Con Dao has Viettel 4G.
Central Highlands and Mekong Delta
Da Lat's cool French-colonial hill station sits at 1,500 metres surrounded by coffee plantations and pine forests. Buon Ma Thuot is the heart of Vietnam's coffee belt, and Buon Don is home to the traditional Elephant Race Festival of the Ede and M'nong communities.
Signal: Da Lat city has good Viettel 4G. Coffee plantation routes around Buon Ma Thuot are covered in town and patchy between. Mekong Delta main towns are 4G; outer canals are variable. Buon Don is covered in the festival grounds area.
Hidden Gems
Ha Giang Loop
highland roadNorthern Vietnam
One of Southeast Asia's most spectacular motorbike roads, winding through towering limestone karst mountains, deep river valleys and ethnic minority villages in Vietnam's far north.
Signal: Viettel has the most consistent coverage on the Ha Giang loop, with signal at most towns and passes. Some of the deepest valleys and cliff-side road sections go offline. Download the full route offline before departing Ha Giang town.
A Roamix eSIM on the Viettel footprint is the best option for the Ha Giang loop. Use it to navigate in towns, communicate with homestay hosts and share the extraordinary scenery at viewpoints with signal.
Phong Nha-Ke Bang National Park
National ParkQuang Binh Province
Home to Son Doong, the world's largest cave, and dozens of other cave systems including the accessible Hang Toi (Dark Cave) and Tu Lan caves. One of Vietnam's most spectacular natural sites.
Signal: Viettel 4G in Phong Nha town and at the Paradise Cave and Dark Cave entrance areas. Hang En and Son Doong cave interiors have no coverage. Download park maps before tours.
Son Doong tour permits sell out a year in advance and are tightly controlled by Oxalis Adventure. Book through their website, confirm your place, and download all pre-tour materials over Roamix data before you travel to Phong Nha.
Dong Van Karst Plateau
archaeological siteHa Giang Province
Vietnam's northernmost point and a UNESCO Global Geopark. Ancient limestone formations, Hmong and Lo Lo minority villages, and a morning market in Dong Van that has barely changed in a century.
Signal: Viettel 4G in Dong Van town and Meo Vac market. The road between them, passing Ma Pi Leng, is intermittent. Download offline maps in Ha Giang city.
Accommodation in Dong Van is book-ahead in peak season (September to November). Lock in guesthouses over Roamix data in Ha Giang city before the signal fades on the mountain pass.
Mui Ne Sand Dunes
desertBinh Thuan Province
Vietnam's only desert-adjacent landscape, with red and white sand dunes, kite surfing and a fishing village atmosphere completely different from the rest of the coast. Three hours from Ho Chi Minh City.
Signal: Viettel 4G throughout Mui Ne town and the White Dunes at Bau Trang. Red Dunes (Doi Cat Do) at the edge of town are fully covered.
Kite surfing schools in Mui Ne book by the hour and communicate entirely via WhatsApp and Zalo. Having Roamix data active on arrival lets you confirm your lesson time and grab directions to the school before the bus drops you off.
Ninh Binh and Trang An
scenic driveNinh Binh Province
Often called the inland Ha Long Bay. Trang An's boat corridors through limestone karsts won UNESCO status in 2014. Hoa Lu, Vietnam's first capital, adds history to natural drama.
Signal: Viettel 4G in Ninh Binh city and Tam Coc boat dock. Trang An boat corridors and Bich Dong Pagoda are well covered.
Ninh Binh is a day trip or overnight from Hanoi, and the 2-hour train connection is the smartest way to arrive. Book train tickets on Vietnam Railways over Roamix data at your Hanoi hotel and download your e-ticket before the morning departure.
Con Dao Islands
IslandBa Ria-Vung Tau Province
Vietnam's most pristine island chain, with near-virgin sea turtle nesting beaches, a difficult history as a French colonial prison, and a small resort scene without the overcrowding of Phu Quoc.
Signal: Viettel 4G on Con Son island, the main island. Remote smaller islands are off-grid. Ferry and flight from Ho Chi Minh City both take roughly 30 to 60 minutes by air.
Con Dao has very limited accommodation and rooms sell out months ahead during peak season. Book your resort or guesthouse well in advance and confirm over Roamix data. The sea turtle nesting season from June to September requires early reservation.
Bac Ha Sunday Market
city districtLao Cai Province
One of the most authentic highland markets in Vietnam. The Flower Hmong arrive in full traditional dress for weekly trading that is not staged for tourists. More genuine than many Sapa experiences.
Signal: Viettel 4G in Bac Ha town. The market is held every Sunday and attracts Flower Hmong communities from surrounding villages.
Getting to Bac Ha from Sapa requires a 2-hour drive on mountain roads. Check road conditions and confirm driver pickup over Roamix data in Sapa the evening before your Sunday departure.
My Son Sanctuary
archaeological siteQuang Nam Province
The spiritual centre of the ancient Cham Kingdom, with brick towers dating from the 4th to 13th centuries. A UNESCO World Heritage site 40 km from Hoi An that rewards an early morning visit before tour buses arrive.
Signal: Viettel 4G at the entrance and main temple clusters (Groups B, C, D and G). Remote outer clusters may have weak signal.
Entry tickets can be bought on-site but guided tours from Hoi An require advance booking. The 30-minute drive involves navigating a narrow road; having Roamix data for Google Maps from the Hoi An departure point is genuinely useful.
Ba Be National Park
National ParkBac Kan Province
Vietnam's largest freshwater lake surrounded by karst forest, with boat trips through limestone caves, Tay minority stilt-house homestays, and near-zero tourist crowds compared to Ha Long Bay.
Signal: Viettel 4G in the park village near Ba Be Lake. Remote trekking trails and the boat routes on the lake itself have intermittent signal.
Ba Be homestay experiences require advance booking via local operators. Confirm your guesthouse and boat guide over Roamix data before the 3-hour drive from Hanoi.
Tra Que Vegetable Village
city districtQuang Nam Province
A functioning organic vegetable farm on a river bend outside Hoi An, where cooking class tours include harvesting, water wheel irrigation and preparing the signature morning glory salad. Far more hands-on than the Old Town restaurant tours.
Signal: Viettel 4G throughout. The village is 3 km from Hoi An Ancient Town and has full urban-level coverage.
Tra Que cooking classes book via several Hoi An operators and sell out in high season (March to August). Book your slot and confirm transport pickup over Roamix data the night before.
Events & Best Seasons
Tet Nguyen Dan
FestivalNationwide, especially Hanoi, Hoi An and Ho Chi Minh City · Late January to mid-February
The most important festival in the Vietnamese calendar. Families reunite, temples overflow with incense, flower markets fill every pavement, and fireworks light up Hoan Kiem Lake at midnight on New Year's Eve. The entire country transforms for roughly two weeks.
Network note
Networks remain operational during Tet but banks, shops and many local restaurants close for the first three days. Book accommodation and transport well in advance as demand spikes across the country.
Roamix tip
Book hotels in Hanoi and Hoi An a month ahead for Tet eve. Use your Roamix data to check which restaurants stay open and to navigate the extraordinary Tet flower markets.
Hoi An Full Moon Lantern Festival
CulturalHoi An Ancient Town, Quang Nam · 14th day of each lunar month, year-round
On each full moon, Hoi An Ancient Town shuts off its electric lights and fills with paper and silk lanterns lining the Thu Bon River. Paper lanterns are floated on the river, traditional music plays in the streets, and the reflection of thousands of lanterns on the water is one of Vietnam's defining images.
Network note
The Ancient Town becomes very crowded on lantern nights and mobile networks can slow in the densest areas near the river. Move away from the main bridge for better signal.
Roamix tip
Check the lunar calendar date before your Hoi An visit to ensure you coincide with a lantern night. Use your Roamix eSIM to navigate to the quieter south bank of the Thu Bon River for the best lantern reflection photos.
Da Nang International Fireworks Festival
FestivalHan River, Da Nang · Late May to mid-July, Saturday evenings
The longest running international fireworks competition in Asia, with teams from eight to ten countries competing on alternating Saturdays over the Han River. The 2025 edition ran from May 31 to July 12 with six competition nights.
Network note
The Han River bridges and west bank grandstand areas draw very large crowds on competition nights, which can slow networks. Pre-download your maps and grandstand location before leaving your hotel.
Roamix tip
The Han River bridges (Dragon Bridge, Nguyen Van Troi) are the best free viewing spots. Grandstand tickets on the west bank sell out weeks ahead. Book over Roamix data from your Hoi An accommodation on the day tickets drop.
Hue Festival
CulturalHue Imperial Citadel and city, Thua Thien-Hue · April to May, held in even years
Vietnam's largest cultural festival, held biennially in even years. Traditional court music (nha nhac, UNESCO Intangible Heritage), royal processions, ao dai fashion shows and international performances fill Hue's Imperial Citadel and surrounding areas.
Network note
Hue city sees a significant visitor increase during the festival. Network capacity holds well in the citadel area, but book accommodation 2 to 3 months ahead as the city fills quickly.
Roamix tip
Confirm your citadel entry tickets for night performances over Roamix data before the event dates. The illuminated Imperial Citadel at night during the Hue Festival is one of Vietnam's most extraordinary sights.
Mid-Autumn Festival (Tet Trung Thu)
CulturalNationwide, especially Hoi An and Hanoi · 15th day of the eighth lunar month, September or October
Vietnam's second most celebrated festival. Children carry lanterns through streets after dark, lion dances weave between mooncake stalls, and the Hoi An Lantern Festival coincides for its most elaborate annual night. Families gather to share mooncakes under the full moon.
Network note
Hoi An Ancient Town is extremely crowded on Mid-Autumn night and data speeds can drop. Navigate to quieter surrounding villages using your Roamix data before the main crowds gather.
Roamix tip
Navigate to the pottery village of Thanh Ha or the village of Cam Thanh for a quieter dragon boat and lotus lantern experience. Roamix data handles the 4 km navigation from the Old Town.
Whale Festival
CulturalCa Na and Mui Ne, Binh Thuan Province · Biannual, late spring and late summer
A traditional fishing community ceremony honouring the whale (ca ong in Vietnamese), believed to protect fishermen at sea. Colourful processions carry whale bones to the sea, accompanied by traditional music and offerings.
Network note
Mui Ne town has good Viettel 4G coverage throughout the festival area. Coastal procession routes near Ca Na are also covered, though beach access roads can become congested.
Roamix tip
The Whale Festival is timed by the lunar calendar and dates vary slightly each year. Confirm exact dates via the Binh Thuan provincial tourism authority over Roamix data when planning your Mui Ne timing.
Elephant Race Festival
CulturalBuon Don, Dak Lak Province · March (typically the third month of the lunar calendar)
An ancient elephant festival of the Ede and M'nong ethnic minorities in the Central Highlands. Mahout-ridden elephants race, swim rivers and play football in a festival that celebrates the traditional relationship between the Central Highlands communities and Asian elephants.
Network note
Buon Don has Viettel 4G coverage in the festival grounds. The 45 km drive from Buon Ma Thuot passes through areas with intermittent signal, so download your route before departing.
Roamix tip
Buon Don is 45 km from Buon Ma Thuot and requires planning around the lunar calendar. Check exact dates for the current year over Roamix data. Research animal welfare practices at your chosen elephant operator carefully before booking.
Quan The Am Pagoda Festival
religiousNgu Hanh Son (Marble Mountains), Da Nang · 19th day of the second lunar month, February or March
A vibrant pilgrimage festival at one of Vietnam's most sacred Buddhist sites, drawing thousands of worshippers to the Marble Mountains complex for chanting, processions and lantern ceremonies. The caves and towers of Ngu Hanh Son are spectacularly lit for the occasion.
Network note
The Marble Mountains have Viettel coverage at the main entrance and lower cave areas. Festival day access roads close to vehicles and crowds concentrate around the main steps.
Roamix tip
The Marble Mountains are accessible by motorbike or taxi from Da Nang Beach hotels in 15 minutes. On festival day, navigate to the side entrance on foot using Roamix data and Google Maps to avoid the main crowd chokepoint.
Vietnam International Travel Mart
FestivalNational Exhibition Construction Centre, Hanoi · April
Vietnam's largest B2B and consumer travel trade show, showcasing local operators, destinations and hospitality businesses from across the country. Relevant for digital nomads and travel bloggers looking to connect with local partners.
Network note
The National Exhibition Construction Centre in Hanoi has full Viettel coverage. The event draws trade visitors from across Vietnam and the region, but crowd density remains manageable.
Roamix tip
The trade show is free to attend on public days and coincides with Hanoi's best spring weather. Check the exact April dates over Roamix data as they vary slightly year to year.
Vietnam Discovery Challenge
SportsMultiple provincial locations · November
A multi-stage adventure race covering trail running, mountain biking and kayaking across different Vietnamese provinces each year. The 2025 edition covered Ha Giang's karst plateau. It draws international participants alongside Vietnamese adventure sports enthusiasts.
Network note
Race route provinces vary annually and coverage depends on location. The Ha Giang edition had Viettel 4G at start and finish towns with intermittent signal on remote karst terrain between checkpoints.
Roamix tip
Entry opens several months before race day. The race route changes provinces annually, so check the current year's location over Roamix data when planning your November timing.
Spring
March to May is ideal for the full length of Vietnam, with moderate temperatures and reducing rain. Tet falls in January or February just before this window and is worth planning around.
Summer
June to August is hot and humid across most of the country. The northern and central regions see the most rainfall. Phu Quoc and the Mekong Delta are at their driest.
Fall
September to November brings typhoon risk to central Vietnam including Da Nang and Hoi An. The north begins to cool and the northeast monsoon arrives. October to November is beautiful in Sapa.
Winter
December to February is the best time for central and southern Vietnam. Hanoi and the north can be cool and misty from December to February, which is atmospheric but requires warmer clothing.
Remote Work from Vietnam
Hoi An, Hanoi's Hoan Kiem area and Ho Chi Minh City's District 1 and 3 have a growing coworking scene with reliable wifi and long opening cafes. Vietnam is an excellent value remote work base.
A Roamix eSIM on the Viettel network handles urban video calls and laptop tethering. A plan of 15 GB or more suits a working week with daily calls alongside sightseeing.
Hoi An has a particularly good collection of coworking-friendly cafes near the Ancient Town that offer fast wifi, good coffee and air conditioning throughout the day.
Get connected the moment you land in Vietnam.
Get your Vietnam eSIMLocal Tips for Vietnam
Language
Vietnamese is tonal and highly localised by region. A connected camera translation app is genuinely useful for menus and signs outside tourist areas. Most Hoi An, Hanoi and Ho Chi Minh City hospitality staff speak functional English.
Tipping
Tipping is not traditional in Vietnam but is increasingly appreciated in tourist areas. Round up restaurant bills or leave 20,000 to 50,000 VND for good service. Tipping boat crew on Ha Long Bay cruises and multi-day tour guides is expected.
Food & Dining
Vietnamese cuisine is extraordinary in its regional variety. Pho in Hanoi, banh mi everywhere, cao lau in Hoi An, bun bo hue in the central region and broken rice in Ho Chi Minh City are each genuinely distinct dishes. Eating at local pho shops and street stalls is both the cheapest and the most authentic option.
Transport
Use Grab in cities for safe and priced rides. For motorbike hire, check the bike thoroughly and photograph any existing damage before signing anything. On the Reunification Express train, soft sleeper berths offer the most comfortable overnight experience.
Emergency Numbers
general
113
police
113
ambulance
115
fire
114
Essential Apps
Grab
The dominant rideshare app in Vietnam, essential for safe and price-fixed rides in Hanoi and Ho Chi Minh City and available in most tourist towns.
Zalo
Vietnam's home-grown messaging app, used by many local hotels, restaurants and guides who may not be on WhatsApp.
Google Translate
Camera translation of menus, signs and prices is genuinely useful across Vietnam where English signage outside tourist areas is limited.
Safety & Health in Vietnam
Vietnam is generally safe for tourists, with petty theft and motorbike bag snatching in Ho Chi Minh City and Hanoi being the main concerns. Traffic is the biggest physical hazard, with very dense motorbike traffic in cities and aggressive driving on rural roads.
Keep your Roamix eSIM active to use Grab for safe rides rather than unregistered taxis, share your live location with contacts when taking overnight trains and check for typhoon warnings during September to November in central Vietnam.
Health Note
Dengue fever and food safety are the main health concerns. Use repellent consistently, drink only bottled or filtered water and be selective with street food until your system adjusts.
Water Safety
Do not drink tap water anywhere in Vietnam. Bottled water is very cheap and available everywhere. Be cautious with ice in very local restaurants outside tourist areas.
Frequently Asked Questions
Vietnam eSIM, connectivity, and travel
What is the best eSIM for Vietnam?
Roamix is a top choice for Vietnam because it connects to Viettel, the network with the widest coverage across the country including the northern highlands, rural areas and islands. It activates automatically on arrival without a SIM counter visit.
Do I need a SIM card for Vietnam?
You do not need a physical SIM. A Roamix Vietnam eSIM gives you local data on arrival without a passport check at an airport counter or the need to swap out your home SIM.
What is the most affordable eSIM for Vietnam?
Roamix offers Vietnam data plans that significantly undercut carrier roaming rates, with tiers sized for a quick Ho Chi Minh City break through to a month-long north-to-south journey.
What is the best way to stay connected as a tourist in Vietnam?
The most reliable option is a Roamix Vietnam eSIM on the Viettel network, which covers the full length of the country including the northern highlands, rural areas and islands where other networks are weaker.
How do I set up a Roamix eSIM for Vietnam?
Buy your plan on the Roamix Vietnam eSIM page before departure, install it over wifi by scanning the QR code, then enable data roaming for the Roamix line. It connects automatically on landing at Noi Bai or Tan Son Nhat airport.
Is my phone compatible with a Vietnam eSIM?
Most recent phones support eSIM, including iPhone XS and newer, Google Pixel 3 and newer, and recent Samsung Galaxy S and A series models. Your phone must be carrier unlocked to use a Roamix eSIM.
Does my eSIM work on Ha Long Bay and the islands?
Signal on Ha Long Bay and offshore islands varies. Viettel has the most consistent coverage, reaching the bay's main islands and cruise routes. Deep cave systems and remote island interiors have no signal on any network, so download offline maps before boarding.
Can I use WhatsApp, Facebook and Google in Vietnam?
Yes. Vietnam has an open internet, so WhatsApp, Facebook, Google, Instagram and TikTok all work normally on a Roamix eSIM without a VPN.
How much data do I need for a two-week trip in Vietnam?
Most travellers covering both north and south use 6 to 10 GB for two weeks, covering maps, Grab rideshare, WhatsApp and photo sharing. Add more if you stream, take frequent video calls or tether a laptop.
Do I need a visa to visit Vietnam?
Citizens of Germany, France, the UK, Italy, Spain, Russia, Japan and South Korea receive a 45-day visa exemption. Most other nationalities can apply for a 90-day e-visa online before arrival. Confirm current requirements with official sources before booking.
Is cash or card better in Vietnam?
Cash is essential throughout Vietnam. International cards work in upscale hotels and tourist restaurants, but street food, local markets, buses and many guesthouses are cash only. Keep enough dong on hand and use ATMs in cities rather than relying on remote areas having them.
Is airport wifi in Vietnam good enough or do I need an eSIM?
Noi Bai and Tan Son Nhat both have free airport wifi, but it is slow and stops at the terminal exit. A Roamix eSIM activates on landing so Grab, maps and Google Translate are live before you step outside, which matters when navigating Vietnamese taxi queues.
Will my eSIM work on the Ha Giang loop and at Dong Van Karst Plateau?
Yes, on Viettel. Towns on the loop including Ha Giang city, Dong Van, Meo Vac and Yen Minh have usable Viettel 4G. The mountain roads between them, including Ma Pi Leng Pass, are intermittent on all networks. Download your full route on Google Maps offline before leaving Ha Giang city each morning. A Roamix eSIM on Viettel is the only reliable choice for this region.
Can I book Son Doong cave tours in Phong Nha over my eSIM?
Yes, and you should do so well before you travel. Son Doong permits are tightly controlled by Oxalis Adventure and sell out up to a year in advance. Use your Roamix data to visit the Oxalis website, confirm your slot and download all pre-tour briefing materials before arriving in Phong Nha. Inside the cave itself there is no signal on any network.
Does my eSIM work at Da Nang International Airport?
Yes. Da Nang International Airport (DAD) has Viettel coverage in and around the terminal. Your Roamix eSIM connects on landing, which is useful for loading Hoi An restaurant reservations, booking a Grab to your hotel and pulling up the Hue imperial palace entry schedule before you leave the arrivals area.
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Stay connected across Vietnam with Roamix
From Hanoi's Old Quarter to Ho Chi Minh City's backstreets, a Roamix Vietnam eSIM activates on landing and covers the full 1,600-kilometre journey on the Viettel network.
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