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Towering limestone karsts in emerald waters at Ha Long Bay, Vietnam
Vietnam · Connectivity

Vietnam eSIM & SIM Cards: The Complete 2026 Connectivity Guide

Choose, buy, activate and manage data in Vietnam: eSIM vs SIM, airport pick-up, top-ups, coverage, tethering, and cross-border options.

Towering limestone karsts in emerald waters at Ha Long Bay, Vietnam
Vietnam · Connectivity📅 Updated 2026-06-17 · last reviewed by Phuong Le📖 3 min readPLPhuong Le15-yr Hanoi history guide
Last reviewed by Phuong Le: 2026-06-17 · Quarterly review

Quick answer

Choose a Vietnam eSIM for instant setup, or a SIM at airports or city shops. Viettel, Vinaphone, MobiFone have 7–30‑day tourist packs. Bring a passport for KYC. 4G is broad; 5G in cities is expanding. Set APN. Tethering works. Top up via apps. Multi‑country eSIMs cover VN–KH.

Buy at airports or city shopsPassport required for KYC4G broad; 5G expanding

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About this guide

Vietnam's mobile connectivity landscape changed considerably after the government approved eSIM technology in 2020. Since then, all three dominant carriers — Viettel, Vinaphone, and MobiFone — have rolled out eSIM support, and international platforms such as Airalo, Holafly, and Nomad now sell Vietnam eSIMs that activate on local networks. By mid-2026, travelers can choose from more than 750 plans across 27-plus providers, with entry-level data packages starting around $3–$4.50 for 1GB. For those arriving at Noi Bai, Tan Son Nhat, Da Nang, or Phu Quoc airports, physical SIMs remain readily available at arrival-hall counters for approximately 150,000–200,000 VND for 3–7GB plans, though city carrier stores typically offer more data options at lower per-GB rates.

Coverage across Vietnam is distributed unevenly between the three major operators. Viettel, which holds over 50% of the market and serves more than 100 million collective subscribers alongside its competitors, maintains the widest rural and mountain reach — including Ha Giang, Sapa, Phong Nha, and the Mekong Delta — making it the only reliably functional option in remote areas. In major cities all three networks perform at comparable levels. On the infrastructure side, Vietnam's overall mobile broadband speed reached 136.21 Mbps as of mid-2025, a year-on-year climb of 37 positions in global download speed rankings. Viettel launched 5G commercially in October 2024 and operated over 30,000 5G base stations covering all 34 provincial capitals by end-2025; Vinaphone followed in December 2024, and MobiFone commercialized 5G on June 23, 2025.

Choosing between a physical SIM and an eSIM comes down to trip length, device compatibility, and registration preferences. Foreign nationals purchasing a physical SIM in Vietnam must present a passport at the point of sale under Decree 49/2017/ND-CP; staff photograph both the traveler and the document to register the SIM on the national database. International eSIM providers, by contrast, require only an email address — no passport scan and no kiosk queue. A practical middle ground for many travelers is a dual-SIM configuration: the home SIM handles calls and OTPs while the Vietnam eSIM carries data. Travelers who need a local +84 number for services such as Grab or bank OTPs should opt for a physical SIM or select a Vinaphone plan that bundles a local number, since most travel eSIMs are data-only.

Key facts & good to know

Mobile networks
Three carriers: Viettel (50%+ share, widest coverage), Vinaphone, MobiFone — all launched 5G between Oct 2024 and Jun 2025.
SIM registration
Foreign nationals must show a passport to buy a physical SIM (Decree 49/2017). Staff photograph you and your passport on the spot.
eSIM option
Legal since 2020. International eSIMs (Airalo, Nomad, Holafly) need only an email — no passport scan, no queue, activate via QR code.
SIM cost at airports
Airport physical SIMs: ~150,000–200,000 VND for 3–7 GB. City carrier stores offer larger data packages at better per-GB prices.
No local number on eSIM
Most travel eSIMs are data-only — no +84 number. Need OTPs or Grab registration? Choose a physical SIM or a Vinaphone plan with a number.
Ghost SIM scam
Any vendor selling a SIM without checking your passport is likely selling an unregistered 'ghost' SIM — buy only at official counters or carrier stores.
Remote area coverage
Ha Giang and northern Sa Pa backcountry can hit dead zones. Download offline maps before departure; Viettel is the only reliable option in remote areas.
Network speed
Vietnam's average mobile broadband speed hit 136.21 Mbps in mid-2025, rising 37 positions in global download speed rankings year-on-year.

The honest pacing

We put this guide together after fielding the same connectivity questions from travelers heading to Vietnam year after year. The short version: eSIM is legal and functional here, physical SIMs are straightforward if you have your passport handy, and the network gap between the three major carriers matters mainly once you leave the cities. What follows covers the specifics — plan pricing, registration rules, coverage differences, and the practical trade-offs — so you can make a decision before your flight rather than while standing in an airport queue.

We've organized the information by the decisions you actually face: whether to buy before you arrive or at the airport, which carrier makes sense for your itinerary, and what the fine print on 'unlimited' data plans really means in practice. If you're spending most of your time in Hanoi, Ho Chi Minh City, or Da Nang, almost any plan will serve you well. If you're heading into Ha Giang or the northern Sa Pa backcountry, the carrier you choose — and whether you've downloaded offline maps beforehand — will make a tangible difference.

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What to skip on 0 days

These are the 4 mistakes 80% of first-time Vietnam travellers make when researching online.Phuong Le has personally seen each one destroy trips that could have been excellent.

✗
Buying a SIM from an unofficial vendor who skips passport verification
Vendors selling SIMs without passport registration are likely providing 'ghost' SIMs, which violates Decree 49/2017/ND-CP and can result in a non-functional or legally problematic connection.
✗
Assuming your travel eSIM includes a local Vietnamese phone numberWhen to consider · Only if you have no need for OTPs or app registration
Most international travel eSIMs for Vietnam are data-only with no +84 number. Apps like Grab and some banking services require SMS OTPs to a local number, so data-only eSIMs will block that workflow.
✗
Treating 'unlimited' eSIM plans as truly unlimited high-speed data
Unlimited plans in Vietnam typically throttle speeds after a daily cap of 1–10GB. If your itinerary involves heavy video calls or large uploads, check the daily high-speed threshold before purchasing rather than assuming consistent full speeds.
✗
Queuing at the airport kiosk to buy a physical SIM when you have an eSIM-compatible phoneWhen to consider · Only if you need a local +84 number or plan a stay of 30 or more days where per-GB cost matters
International eSIMs activate via QR code before or on arrival, require only an email address, and skip both the passport scan and the often lengthy airport counter queue. The convenience advantage disappears only for long-stay travelers prioritizing the lowest per-GB cost.

0-day Vietnam itinerary FAQ

Should I get an eSIM or a physical SIM in Vietnam?
Choose an eSIM if your phone supports it and you want to set up before you fly or on arrival over Wi‑Fi. A physical SIM is simple to buy at airports and shops, often includes local calls/SMS, and is useful if you need a Vietnamese number. Prices for comparable data are similar; international eSIMs are often data‑only, while in‑store carrier eSIMs with a local number require ID and a visit.
Which mobile networks cover the country and where is 5G available?
Viettel has broad nationwide coverage, including many rural areas. Vinaphone and MobiFone perform well in cities and along main routes. 5G is live in Hanoi, Ho Chi Minh City, Da Nang, and other large cities; elsewhere you will see mostly 4G/LTE. Remote valleys, highlands, and offshore boat trips may drop to 3G/2G or have no signal.
How much does data cost in 2026, and what should I budget?
Local prepaid plans typically run 100,000–250,000 VND ($4–$10) for 7–15 days with 3–10 GB or daily 1 GB, and 250,000–450,000 VND ($10–$18) for 30‑day packs with 10–30 GB or daily 2–5 GB. International eSIMs are about $5–$12 for 7 days (3–10 GB) and $12–$30 for 15–30 days (5–20 GB). Many plans slow to 128–512 kbps after a daily cap. For two weeks, budget roughly $10–$25 for moderate use and $25–$40 for heavy maps/video.
Can I pre‑book and pick up at the airport, or get an eSIM instantly?
Yes. Airport pickup is available at SGN (Ho Chi Minh City), HAN (Hanoi), and DAD (Da Nang); order online, show your passport, and a clerk will activate the SIM in 5–10 minutes. eSIM vendors email a QR code, often instantly or within a few hours (some take up to 24 hours); scan it while on Wi‑Fi. Many sellers let you change pickup dates or eSIM start dates before activation—check the cutoff times.
Can I customise data, calls, and validity—and get a local number for apps?
In‑country carriers let you choose data size and validity (7, 15, 30 days) and add voice/SMS; these plans include a Vietnamese number. Many international eSIMs are data‑only and do not provide a local number. For OTPs and ride‑hailing, either choose a voice add‑on locally or keep your home SIM active in the second slot for SMS.
What do I need to use a local SIM or eSIM, and how do activation and top‑ups work?
Your phone must be unlocked; eSIM works on recent iPhone, Pixel, and Samsung models, and a nano‑SIM fits most phones. Vietnam requires SIM registration to an ID, so bring your passport for store pickup/registration. Activation takes a few minutes, and you can top up at carrier or convenience stores or in carrier apps; data packs usually apply immediately.
Is hotspot tethering allowed, and are there fair‑use limits?
Hotspot is allowed on local prepaid SIMs and carrier eSIMs. Some international eSIMs restrict or disable tethering, so check the plan details before purchase. Many plans include 1–5 GB of high‑speed data per day, then throttle for the rest of the day; heavy laptop use can consume 3–5 GB daily.
What are the cancellation and refund rules for SIM/eSIM purchases?
Physical SIMs are generally non‑refundable once registered or activated; uncollected airport orders can often be cancelled 24–48 hours before pickup, sometimes with a fee. eSIMs are usually refundable before the QR code is issued or before you install; after activation, refunds are uncommon. Date changes and plan upgrades are commonly allowed prior to activation; downgrades may be limited or fee‑based.

People also ask

Can I move an eSIM to a new phone if mine is lost or replaced in Vietnam?
Most eSIM profiles are one-time installs tied to one device. To move it, you usually need the seller to reissue a QR/code; some carriers support in-phone transfer, but not all. Do not delete the original profile until service works on the new device, and expect ID checks and a possible fee.
Will my home number still receive texts if I use a local line on a dual-SIM phone?
Yes. Set the local line for data and keep your home line active for calls/SMS, but incoming texts and calls can trigger roaming charges from your home carrier. On single-SIM phones, inserting a local card disables your home number until you swap back in the original SIM.
Do local prepaid plans include roaming in Cambodia, Laos, or Thailand?
Prepaid plans from Vietnam carriers rarely include international roaming by default. Some sell roaming add-ons at extra cost, and pay-per-use rates can be high. If you need multi-country coverage, look for a regional eSIM that lists the countries you plan to visit.
How much mobile data do I need for a 1-2 week trip in Vietnam?
Light use (messaging, maps, ride-hailing, browsing) is roughly 150-400 MB per day; social apps with photos add about 200-500 MB per day; streaming video uses about 300-700 MB per hour at 480p. For one week without much video, 3-5 GB usually covers it; with regular video, plan for 10-15 GB.
Is public Wi-Fi in Vietnam safe to use, and should I use a VPN?
Free Wi-Fi is common in hotels, cafes, and airports, but open networks are not encrypted and security varies. Use a VPN for logins or payments, and avoid accessing sensitive accounts on unknown networks. Mobile data is generally more private than open Wi-Fi.
What are the emergency numbers in Vietnam, and can I call without a SIM or credit?
Dial 113 for police, 114 for fire, and 115 for ambulance. You can place these calls without credit, and most phones can call even without a local SIM if there is network coverage. State your location and a nearby landmark when connected.

Verified sources

  1. ATL DMC booking log · 12,000+ trips since 2011
  2. Yesim – Is eSIM Available in Vietnam? Complete Guide 2026 · https://yesim.app/blog/is-esim-allowed-in-vietnam/
  3. Indochina Voyages – Best Mobile Network in Vietnam 2026 · https://www.indochinavoyages.com/travel-blog/best-mobile-network-in-vietnam
  4. Vietnamesim.com – Vietnam Mobile Operators 2026 · https://vietnamesim.com/mobile-operators/
  5. Traveltomtom – Best Prepaid SIM Card in Vietnam 2026 · https://www.traveltomtom.net/destinations/asia/vietnam/best-prepaid-sim-card-in-vietnam-for-tourists
  6. Vietnam Backpacker Hostels – Vietnam Tourist SIM Card Guide 2026 · https://vietnambackpackerhostels.com/vietnam-tourist-sim-card/
  7. eSIMs.io – Best eSIM for Vietnam 2026 (27 Providers Compared) · https://esims.io/en/countries/vietnam
  8. The Broke Backpacker – Buying a SIM Card in Vietnam 2026 · https://www.thebrokebackpacker.com/best-sim-card-vietnam/

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PL

Phuong Le · primary author

15-yr Hanoi history guide

Specialty: Hanoi · Halong Bay · Vietnam itineraries.

Editorial process: Pacing and picks tested across thousands of ATL trips · reviewed quarterly.

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