The short verdict
For Vietnam, Flysimio on Viettel is the pick for coverage on the widest-reaching Vietnamese network, but be honest with yourself about how much data you need: Nomad undercuts us substantially per gigabyte on large Vietnam plans, and the dated price index below shows the gap. Viettel, the largest Vietnamese carrier, has the broadest coverage including rural provinces, mountain areas, and the islands of Phu Quoc and Con Dao, plus the fastest 5G rollout. Mobifone is a strong second in the cities and Vinaphone is competitive, but Viettel wins everywhere outside the big urban centres.
Flysimio Vietnam eSIM
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Vietnam eSIM price index — August 2026
Across 4 providers and 15 plans compared in August 2026, the cheapest Vietnam eSIM data on a standard 3–50 GB plan works out at $1.58/GB (Flysimio, priced live). On the same measure the cheapest rival plan is Nomad at $0.78/GB — cheaper than our best equivalent plan, which costs 102% more per gigabyte.
| Provider | Plan | Price | Price per GB | Network | Best for | Price checked |
|---|---|---|---|---|---|---|
| Nomad | 50 GB / 30 days | $39.00 | $0.78/GB | Vietnamobile / MobiFone | Easy app | Aug 14, 2026 |
| Flysimio | 20 GB / 30 days | $31.58 | $1.58/GB | Viettel Mobile / Vinaphone | Live | |
| Nomad | 10 GB / 30 days | $17.00 | $1.70/GB | Vietnamobile / MobiFone | Easy app | Aug 14, 2026 |
| Flysimio | 10 GB / 30 days | $17.20 | $1.72/GB | Viettel Mobile / Vinaphone | Live | |
| Flysimio | 3 GB / 15 days | $5.65 | $1.88/GB | Viettel Mobile / Vinaphone | Live | |
| Flysimio | 5 GB / 30 days | $9.43 | $1.89/GB | Viettel Mobile / Vinaphone | Live | |
| Nomad | 5 GB / 30 days | $10.00 | $2.00/GB | Vietnamobile / MobiFone | Easy app | Aug 14, 2026 |
| Flysimio | 1 GB / 7 days | $2.13 | $2.13/GB | Viettel Mobile / Vinaphone | Live | |
| Flysimio | 50 GB / 180 days | $109.20 | $2.18/GB | Viettel Mobile / Vinaphone | Live | |
| Nomad | 1 GB / 7 days | $4.00 | $4.00/GB | Vietnamobile / MobiFone | Easy app | Aug 14, 2026 |
| Airalo | Unlimited (3 GB/day) / 7 days | $27.00 | — | VNPT | Coverage & app | Aug 14, 2026 |
| Holafly | Unlimited / 7 days | $27.50 | — | Vinaphone (VNPT) | Unlimited data | Aug 14, 2026 |
| Airalo | Unlimited (3 GB/day) / 30 days | $69.00 | — | VNPT | Coverage & app | Aug 14, 2026 |
| Holafly | Unlimited / 30 days | $73.90 | — | Vinaphone (VNPT) | Unlimited data | Aug 14, 2026 |
| Flysimio | Unlimited (2 GB/day) / 30 days | $120.00 | — | Viettel Mobile / Vinaphone | Live |
- Airalo · Unlimited (3 GB/day) / 7 days: Airalo bills this as "Unlimited": 3 GB per day at full speed, then throttled to about 1 Mbps. Airalo's Vietnam store lists unlimited packages only.
- Holafly · Unlimited / 7 days: Unlimited with no daily high-speed cap; Holafly applies a fair-use policy for at most one day at a time.
- Airalo · Unlimited (3 GB/day) / 30 days: Airalo bills this as "Unlimited": 3 GB per day at full speed, then throttled to about 1 Mbps.
- Holafly · Unlimited / 30 days: Unlimited with no daily high-speed cap; Holafly applies a fair-use policy for at most one day at a time.
- Flysimio · Unlimited (2 GB/day) / 30 days: 2 GB per day at full speed, then 1 Mbps. Sold as 1–30-day passes; 30 days is priced here for comparison.
How this table is priced. Flysimio prices are read live from our carrier catalog every time this page loads, so the figure here is the figure at checkout. Competitor prices are the US-dollar price shown on each provider's own site, read on the date in the last column and linked to the page we read it from; promotional prices are marked alongside the list price. Price per GB is the plan price divided by its included data — unlimited passes have no per-GB figure and are ranked by total price instead. Full method: how we test, the eSIM Price Index and what an eSIM costs.
- Nomad — checked Aug 14, 2026 — www.nomadesim.com/vietnam-eSIM
- Airalo — checked Aug 14, 2026 — www.airalo.com/vietnam-esim
- Holafly — checked Aug 14, 2026 — esim.holafly.com/esim-vietnam/
Coverage across Vietnam
| Destination | Coverage | Notes |
|---|---|---|
| Hanoi | 5G on Viettel and Mobifone | Full coverage; Old Quarter and Hoan Kiem area excellent |
| Ho Chi Minh City | 5G on all carriers | District 1 and tourist areas fully covered |
| Hoi An and Da Nang | 4G on Viettel and Mobifone | Strong coverage throughout; beach areas covered |
| Ha Long Bay (cruise) | 4G on Viettel near shore | Coverage on the bay itself; stronger near Cat Ba Island |
| Hue | 4G on Viettel | City centre and Imperial City well covered |
| Phu Quoc Island | 4G on Viettel | North and south Phu Quoc covered; interior jungle patchy |
| Sapa and the north mountains | 4G on Viettel in town | Viettel covers Sapa town; trekking routes in valleys have signal; rice terrace ridges patchy |
| Mekong Delta | 4G on Viettel | Major towns covered; remote waterways and small islands variable |
Which Vietnam eSIM for your trip?
| Trip type | Recommended | Why |
|---|---|---|
| Hanoi + Ha Long Bay | Flysimio 5 GB (Viettel) | Viettel covers both destinations |
| Ho Chi Minh City + Mekong Delta | Flysimio 5 GB (Viettel) | Viettel has best Mekong rural coverage |
| Central Vietnam (Da Nang, Hoi An, Hue) | Flysimio 5 GB (Viettel) | Full coverage of central coast |
| Phu Quoc beach holiday | Flysimio 5 GB (Viettel) | Viettel covers the island's main tourist areas |
| North Vietnam trekking (Sapa, Ha Giang) | Flysimio 10 GB (Viettel) | Viettel reaches mountain towns; signal limited on remote passes |
| Full country north to south | Flysimio 10 GB (Viettel) | One Viettel plan covers the entire country |
Installing your Vietnam eSIM
- Buy before your flight — install on home Wi-Fi.
- Open the Flysimio email for the QR code.
- iPhone: Settings → Cellular → Add eSIM → Use QR Code.
- Android: Settings → Network & Internet → SIMs → Add SIM.
- Scan the QR code.
- Label it "Vietnam" and set as data line.
- Disable Data Roaming on your home SIM.
- Your phone connects to Viettel when you land at Hanoi (HAN), Ho Chi Minh City (SGN), or Da Nang (DAD).
Frequently asked questions
What is the best eSIM for Vietnam?
Flysimio on the Viettel network is a strong Vietnam pick for most travelers, and was marginally cheaper than Nomad at 5 GB in August 2026 — but Nomad is far cheaper on large Vietnam plans, so check the dated price index if you need 20 GB or more. Viettel has the widest coverage in Vietnam including rural mountains, islands, and the Mekong Delta, and Flysimio offers the lowest price.
Does eSIM work in Ha Long Bay?
Yes, on Viettel. Ha Long Bay has 4G coverage near shore and around Cat Ba Island. On overnight cruise routes in the middle of the bay, signal is present but weaker. Most cruise ships also have Wi-Fi, which is useful when signal drops.
Does eSIM work in Hoi An?
Yes. Hoi An Ancient Town and the beach area (An Bang, Cua Dai) are fully covered by Viettel 4G. The cycling routes between Hoi An and Da Nang are also well covered.
Which eSIM uses Viettel in Vietnam?
Flysimio, Holafly, and Nomad route through Viettel for Vietnam plans. Airalo and Saily use Mobifone. Viettel has the widest geographic coverage and is the recommended carrier for any travel outside major cities.
How much data do I need for Vietnam?
Vietnam has very fast and cheap mobile data. For a two-week trip with moderate use (maps, social, messaging), 5 GB is sufficient. Vietnam's fast network means you consume data quickly, so heavy users should consider 10 GB.
Does eSIM work in Sapa?
Yes, on Viettel. Sapa town has 4G LTE. Trekking routes in the Muong Hoa Valley and to Ta Van village have signal on the main paths. Remote mountain passes and ridge lines above the valley have reduced or no signal.
Maya Okafor
Senior Travel Connectivity Editor
Maya has tested eSIMs across 40+ countries over five years of full-time travel — from Tokyo subways to Patagonian backroads. She runs Flysimio’s hands-on network and speed testing.