No. The line registers on Viettel inside Vietnam. Leave data roaming off after you land.

Does 5G exist everywhere?

No. Opensignal’s August 2026 report scored Viettel’s 5G coverage experience at 1.1 out of 10, against an overall coverage experience of 8.4. Everyday use is often 4G outside city cores.

What happens in a dead zone?

The phone drops to a weak cell or to no service. That does not delete the eSIM. Service returns when you reach the next covered stretch.

Are the speeds on these pages your tests?

No. They are Opensignal, nPerf, and Ookla figures, labeled with the source and date. City pages say when a number is national rather than local.

Which trip needs Viettel most?

Ha Giang, Sapa, and other highland roads. Cities are fine on more than one network. The mountains are where the local network choice shows up.

Viettel coverage across Vietnam

This eSIM connects to Viettel’s own network, not to a roaming partner. Viettel’s published strength is geographic reach, including mountain towns. National speed reports do not promise a number for one valley or one beach.

Travelers usually ask two different questions and mash them into one. The first is “will I have a signal in Sapa?” The second is “how many megabits will a speed test show in District 1?” A local Viettel eSIM is an answer to the first question more than the second. Viettel is the incumbent with the widest set of rural and highland sites. Vinaphone and MobiFone are real networks with strong city performance. A roaming eSIM that names only VNPT is a Vinaphone line with extra hops, which is a fine city product and a weaker mountain product.

What the national reports are allowed to say

Opensignal’s August 2026 Vietnam report, collected from 1 April to 29 June 2026, put Viettel’s everyday download at 56.7 Mbps, just ahead of MobiFone and Vinaphone, and its coverage experience at 8.4 out of 10 against 5.5 for Vinaphone and 4.3 for MobiFone. The same report’s 5G download crown sat with Vinaphone and MobiFone, not Viettel. nPerf’s 2026 barometer (April 2025–March 2026) ranked Vinaphone first overall and Viettel second, with Viettel at 76.48 Mb/s download and the lead on latency and web browsing. Ookla’s Speedtest Global Index for August 2026 is a country median across operators, 360.77 Mbps down, and must not be quoted as a Viettel result.

Published speeds for Viettel

These figures come from independent reports. They are national results, not a test run by eSim For Vietnam in Vietnam overall, and not a promise of the speed you will see on a given street.

Everyday download speed: Viettel 56.7 Mbps, compared with MobiFone 55.4 Mbps and Vinaphone 54.6 Mbps.
5G download: Viettel 247.5 Mbps. MobiFone measured 320 Mbps and Vinaphone 339.2 Mbps on 5G in the same report.
5G upload: Viettel 26.3 Mbps, MobiFone 31.9 Mbps, Vinaphone 29.4 Mbps.
Coverage experience (0–10): Viettel 8.4, Vinaphone 5.5, MobiFone 4.3.
5G coverage experience (0–10): Viettel 1.1, Vinaphone 0.3, MobiFone 0.2.
Consistent quality: Viettel 78.8% of tests, MobiFone 77.4%, Vinaphone 68.6%.

Source: Opensignal, Vietnam Mobile Network Experience, August 2026 (collected 1 April 2026 – 29 June 2026). Read the report.

nPerf’s 2026 edition, measurements April 2025 – March 2026 ranked Vinaphone first overall (74,587) and Viettel second (71,703). In that barometer Viettel’s download bitrate was 76.48 Mb/s (+49% versus the previous nPerf year). nPerf also credited Viettel with the lead on overall latency and on web browsing.

Source: nPerf, Barometer of mobile Internet connections in Vietnam, 2026 edition, measurements April 2025 – March 2026. nPerf PDF.

Ookla’s Speedtest Global Index for Vietnam, updated August 2026, shows a country median mobile download of 360.77 Mbps, upload 59.84 Mbps, and latency 20 ms. That median mixes every operator. It is not a Viettel score.

Source: Ookla Speedtest Global Index, Vietnam median country speeds, August 2026. Speedtest Global Index.

How to read a city page

Each page below describes the place in practical terms: the town center, the road in, the boat or the pass where phones go quiet, and what a normal day does to a 5GB allowance. Where we could not find a published city breakdown, the page shows the national figures and labels them as national. We do not invent a speed-test screenshot for a district.

Hanoi and the roads north toward Ninh Binh and Ha Long.
Ho Chi Minh City, then the south and the delta.
Da Nang and Hoi An, including the Hai Van pass.
Sapa and Fansipan and the Ha Giang Loop.
Ha Long Bay, Phu Quoc, and Nha Trang.

The plan behind all of these pages is the same product: 5GB of high-speed data per day on Viettel, hotspot included, no voice and no SMS, no passport upload. The daily bucket resets at 23:59 Vietnam time. When it is empty, data stops. It does not fall back to a slow unlimited speed. Prices stay $9.99 for 7 days, $14.99 for 15 days, and $18.99 for 30 days.

Viettel coverage for a trip around Vietnam

What the national reports are allowed to say

How to read a city page

Get the local Viettel eSIM

Questions