HelloRoam is a global eSIM provider offering instant mobile data in 175+ countries. Buy prepaid travel eSIM plans with no extra fees, no contracts, and instant activation on any eSIM-compatible device.
Get your Vietnam eSIM and enjoy reliable internet anywhere.
Great value data plans, starting from $3.16. Reliable connection from top regional networks. Works with all eSIM-compatible mobiles.
Start your trip with an eSIM for Vietnam and skip the sky-high charges abroad! Whether you're in bustling cities or quiet villages, stay connected with a travel eSIM.
Vietnam
5GUp to 5G support
Data sharing available
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Install your eSIM before or during your trip. Your plan begins once you arrive at your destination and turn on your eSIM. User guide →
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Data plans available for Vietnam
Valid for
Network: T-Mobile
Plans can change, and that's okay. With HelloRoam, you can request a refund for your eSIM within 180 days of purchase.
Learn moreSee how our pricing, coverage, and support compares.
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HelloRoam offers eSIM plans for Vietnam starting from $4.92. Connect on 5G networks including Vietnamobile, Vinaphone, and Viettel Mobile. A smart data option for Irish travellers visiting Hanoi. 175+.
Pick a data plan for your destination and complete checkout.
Scan the QR code to install your eSIM instantly.
Your eSIM installs instantly and activates when you land.
Track usage, top up data, and manage all your eSIMs in one place.
Pick a data plan for your destination and complete checkout.
Scan the QR code to install your eSIM instantly.
Your eSIM installs instantly and activates when you land.
Track usage, top up data, and manage all your eSIMs in one place.
| Feature |  | Local provider | Limited data eSIM |
|---|---|---|---|
| 180-day refund policy |  |  | |
| 24/7 live chat support | |  | |
| €0 activation fees | | | |
| 99.8% uptime guarantee | | | |
| No data overage charges | | | |
| Instant QR code delivery | | | |
| Premium Vietnam carrier networks | | | |
Need a hand? Our support team is available 24/7. Just send us a message and we'll get you sorted.
Simply download the app, install your eSIM, and pick a data plan. It activates straight away when you arrive.
Use your eSIM for data while keeping your main SIM active for calls and messages. Works alongside your Three, Vodafone, or Eir SIM.
If you have 3G/LTE and another mobile carrier in your area has better 4G/5G, we'll switch you over straight away.
Never get caught short. When you've used 80% of your data, we'll send you a notification.
Enjoy safe, stable internet on trusted local networks, optimised for speed and security.
Stay connected abroad with regional or global data plans wherever you travel.
Share your mobile internet using your eSIM with other devices easily and quickly.
Vietnam has 5G mobile coverage in Hanoi and main cities. Vietnamobile, Vinaphone, and Viettel Mobile are the core networks. For Irish visitors, Vietnam is outside the EU, so Irish carrier EU roaming does not apply. A HelloRoam eSIM from $4.92 is typically far cheaper than international daily roaming add-ons. A HelloRoam eSIM means you arrive in Hanoi connected without hunting for a SIM card at the airport. 175+.
Sort your data before your flight from Dublin
Buy your HelloRoam eSIM for Vietnam at home, activate it over Wi-Fi, and enable data when you land in Hanoi. You skip the airport telecom queues entirely and step off the plane already connected.
Keep your Irish number active
On a dual SIM phone, keep your Eir, Three IE, or Vodafone IE SIM for calls and texts while using HelloRoam for data in Vietnam. Family and colleagues back in Ireland can still reach you on your regular Irish number.
Offline maps save data on city breaks
Download Google Maps or Maps.me for Hanoi offline before you leave Ireland. Offline navigation saves data and works even in indoor areas with weaker signal. Vietnam cities are generally well covered but rural areas can be patchy.
Travel insurance and emergency numbers
Bring your EHIC or travel insurance details. The emergency number in most countries is 112 or local equivalents. Your HelloRoam eSIM keeps emergency apps, insurance portals, and the Irish embassy contact details accessible throughout your Vietnam trip.
Currency and card acceptance
Notify your Irish bank before travelling to Vietnam. Card acceptance is generally good in Hanoi but carry some local currency for smaller vendors and public transport. Currency conversion apps work well on a HelloRoam data connection.
HelloRoam connects on Vietnamobile, Vinaphone, and Viettel Mobile in Vietnam. These are the leading 5G networks in Vietnam with strong coverage in Hanoi and major tourist areas. Your eSIM automatically selects the best available signal.
Your connectivity options for a Vietnam trip from Ireland.
| Category | HelloRoam eSIMRecommended | Local Vietnam SIM card | Eir, Three IE, or Vodafone IE roaming in Vietnam |
|---|---|---|---|
| Typical cost | $4.92–$35.00 total | $2.50–$8.00 total | $10.00–$20.00/day |
| Details | Plans from $4.92. Buy before your flight from Dublin, activate at home, and arrive in Hanoi already on local 5G data. | Available at Hanoi airport but requires setup time after a long flight. Prepaid tourist SIMs involve passport registration and unused data is typically forfeited on return. | Outside the EU, Irish carrier international roaming can cost $5 to $15 per day. A week in Vietnam on roaming could mean $35 to $100 in data charges. HelloRoam starts at $4.92. |
Prices approximate as of April 2026. Actual savings vary.
Vietnam is a popular destination for Irish holidaymakers and those visiting family or friends. The ideal season to visit Hanoi depends on the local climate cycle.
Bien Hoa is a major industrial city in Dong Nai province, part of the greater Ho Chi Minh City economic zone. HelloRoam keeps you connected here.
Viettel and Vinaphone cover Bien Hoa with 4G. About 30 km from Tan Son Nhat Airport in Ho Chi Minh City.
Can Tho is the Mekong Delta's main city, famous for its floating markets, river life, and fresh tropical fruit. HelloRoam keeps you connected as you explore the waterways.
Viettel covers Can Tho with 4G. Activate before your boat trip to the Cai Rang floating market.
Visit Cn Th and stay online with HelloRoam data plans that cover all of Vietnam.
Can Tho in the Mekong Delta has Vinaphone 4G coverage in the city center. The river network areas have variable signal.
Da Nang is Vietnam's coastal gem, a modern city backed by mountains and blessed with long sandy beaches. It's the perfect base for day trips to Hoi An and the Marble Mountains.
Use HelloRoam data to book beach clubs, scooter rentals, and day trips to Hoi An without hunting for a local SIM card.
Ha Noi is the official romanised spelling for Vietnam's capital, a city of history, lake temples, and one of Asia's best street food scenes. HelloRoam keeps you connected.
Viettel 4G covers all of Hanoi. Activate before landing at Noi Bai International Airport.
HelloRoam covers Hai Ba Trng and all of Vietnam with fast, reliable mobile data.
Hai Ba Trung district in Hanoi has Vinaphone 4G coverage. This central district has consistent signal throughout.
Hai Phong is Vietnam's main northern port city and gateway to Cat Ba Island and Ha Long Bay. HelloRoam keeps you connected from the city to the bay.
Viettel and Mobifone cover Hai Phong with 4G. Take the fast ferry from Hai Phong to Cat Ba Island.
HelloRoam gives you instant data access in Haiphong, Vietnam with no extra fees.
Haiphong has Vinaphone 4G coverage across the city. Cat Bi International Airport has terminal coverage for travelers.
Hanoi is Vietnam's ancient capital, a city of tree-lined boulevards, French colonial architecture, the Old Quarter's maze of streets, and some of the world's best street food.
Hanoi's Old Quarter is dense and maze-like. Keep HelloRoam running so you never lose your way between pho stops.
Stay connected in Ho Chi Minh City with HelloRoam eSIM data plans that work across Vietnam.
Ho Chi Minh City has Vinaphone 4G throughout. Tan Son Nhat Airport has strong indoor signal in all terminals.
Hue is Vietnam's imperial city, a UNESCO-listed complex of palaces, tombs, and pagodas along the Perfume River. HelloRoam keeps you connected as you explore.
Viettel covers Hue with 4G. Activate before landing at Phu Bai Airport or arriving on the Reunification Express train.
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"Super easy to set up! Had data the moment I landed. Saved me so much hassle compared to getting a local SIM."
Sarah M.
"Used HelloRoam for my Europe trip. Worked perfectly in 5 different countries without any issues."
James K."Best travel eSIM I have used. Fast speeds, great coverage, and excellent customer support when I had questions."
"Finally a reliable travel data solution! No more hunting for WiFi or paying high carrier fees."
Emma L."Instant activation, great speeds, and the price was very reasonable. Will definitely use again!"
Michael R.
"My go-to for international travel now. Simple, affordable, and just works everywhere I go."
David T.An eSIM (embedded SIM) is a digital SIM card built into your mobile, tablet, or smartwatch. It lets you activate plans without inserting a physical SIM card. Unlike traditional SIMs, eSIMs are reprogrammable. You can switch carriers or plans instantly on devices like iPhone 14, Samsung Galaxy S23, or Google Pixel 8.
To check if your mobile supports eSIM, go to Settings, then Cellular (iPhone) or Settings, then Network & Internet (Android) and look for 'Add eSIM' or 'SIM card manager'. Most flagship mobiles released after 2018 support eSIM, including iPhone XS and newer, Samsung Galaxy S20+, Google Pixel 3+, and many modern Android devices. You can also dial *#06# to see if an EID (eSIM identifier) appears.
To install your HelloRoam eSIM, follow these 3 steps: (1) Purchase your plan from the HelloRoam dashboard and receive your QR code via email within minutes. (2) Open Settings, then Cellular, then Add eSIM on your device (iPhone) or Settings, then Network & Internet, then Mobile Network (Android). (3) Scan the QR code or enter the manual activation code to complete installation in 2 to 5 minutes. Make sure you're connected to Wi-Fi during setup.
eSIM activation is usually instant but can take 2 to 10 minutes depending on carrier conditions and signal strength. If activation takes longer than 10 minutes, try these steps: restart your device, toggle aeroplane mode on and off for 30 seconds, make sure the eSIM profile is set as your active data line, or check that you're in an area with good network coverage.
Yes, most modern mobiles support dual SIM. You can use one physical SIM and one eSIM at the same time. This is ideal for Irish travellers who want to keep their Three, Vodafone, or Eir number active for calls and texts while using a HelloRoam eSIM for affordable data abroad. You can choose which SIM handles calls, messages, and data in your device's cellular settings under 'Primary' or 'Default' line options.
5G support on HelloRoam eSIMs depends on the local carrier network included in your plan and your device's 5G compatibility. Many HelloRoam plans include 5G access where partner networks offer 5G coverage in major cities and urban areas. Your device must support 5G bands used in the Vietnam (check device specifications), and you'll automatically connect to the fastest available network (5G, 4G LTE, or 3G) based on coverage availability.
You can check your HelloRoam eSIM data usage in two ways: (1) HelloRoam Dashboard: log into your account at helloroam.com to view real-time data usage, remaining balance, and plan expiry date. (2) Device Settings: on iPhone, go to Settings, then Cellular, then your eSIM line. On Android, go to Settings, then Network & Internet, then Mobile Network, then Data Usage. Dashboard data updates every 15 to 30 minutes, while device-level usage is tracked locally and may differ slightly.
Refund eligibility varies by plan. Generally, refunds are available if the eSIM has not been installed or activated. Contact support with your order ID for refund requests. Once approved, refunds typically process within 5 to 14 business days depending on your payment provider and bank processing times.
QR codes are typically single-use for security reasons. If you need to reinstall, use the reinstall option in your account or contact support for a new activation method.
Contact HelloRoam support through multiple channels: (1) Live chat available 24/7 on our website at helloroam.com/contact. (2) Email us at help@helloroam.com with your order ID for faster help (average response time under 2 hours). (3) Use the in-app Help section for instant answers. (4) Check our FAQ database. For urgent issues while travelling, live chat gives you the fastest resolution.
The best eSIM in Vietnam depends on your needs, but HelloRoam's Vietnam eSIM is a top choice for travellers. It partners with major networks like Three Ireland, Vodafone Ireland, and Eir. According to ComReg's 2025 coverage report, these carriers cover over 99% of the Irish population with 4G LTE, and 5G is expanding across Dublin, Cork, and Galway. HelloRoam connects you to the strongest available network automatically. Travellers in Dublin, Cork, and Limerick can expect 5G speeds between 150 and 300 Mbps, while rural areas maintain strong 4G for maps, streaming, and calls.
Yes, you can easily purchase and activate an eSIM for Vietnam before you travel or when you arrive. HelloRoam offers instant digital delivery, so there's no need to visit a shop or wait for shipping. Simply buy your eSIM online, scan the QR code sent via email, and connect to a 4G/5G network within minutes. The eSIM works with all major Vietnam carriers, giving you coverage across the country. It's ideal for tourists, business travellers, and remote workers who want reliable connectivity without expensive charges or physical SIM card swaps.
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