How much eSIM data for 30 days in Vietnam?
For 30 days in Vietnam with normal daily use, TripUtils estimates 12–18 GB. A 20 GB plan is the usual buffer. Not a live price. Grab, maps and translation sit in normal use. Overnight buses and hauls between Hanoi, Hoi An and HCMC do not by themselves require the heavy setting — video does.
Photo: Valeria Drozdova / PexelsTravel essentials in Vietnam
The four things that save the most money or hassle before you go.
eSIM for Vietnam
Mobile data in Vietnam from the moment you land, instead of costly roaming. Install before you fly.
See Saily plans →Airport transfer
Pre-book a ride from the airport to your stay – or compare with a taxi or public transport on arrival.
Find a transfer →Tours & tickets
Attractions, tours and activities in Vietnam – compare prices on more than one site.
Browse Klook →Flight delayed?
3+ hours late or cancelled? Up to €600 per passenger under EU261, depending on distance.
Check claim (AirHelp) →Affiliate links: TripUtils may earn a commission at no extra cost to you. Affiliate disclosure. TripUtils does not show live prices.
What to do next
EU roaming does not cover Vietnam. A 20 GB plan is the usual buffer. Open Saily and pick a live Vietnam plan.
Roaming in Vietnam on an Austrian plan: what A1 and Drei charge
Vietnam is outside EU roam-like-at-home, so the EU data in an Austrian plan does not apply there. Published prices, checked on 22 Oct 2026 (euros incl. VAT):
| Network | Option | Data | Price |
|---|---|---|---|
| A1 | Roaming Pass (Zone 1) | per started GB | €4.90 |
| Drei | Roaming-Paket Go | 1 GB, 15 days | €5.00 |
| Drei | Roaming-Paket Go Select | 5 GB, 15 days | €10.00 |
For the 20 GB planning size (30 days), A1’s Roaming Pass would bill 20 × €4.90 = €98.00. A1 says the Roaming Pass is switched on automatically for every tariff signed since 24 June 2026, and it blocks roaming data at a default limit of €60, which you can raise yourself. Drei packages last 15 days, so a longer trip needs packages for each period.
Magenta prices depend on the tariff — look them up in Magenta’s roaming finder. Older tariffs without these options can cost more. Sources: A1, Drei, Magenta.
Planning size
| Habits | 30-day range | Planning size |
|---|---|---|
| Normal (maps, messages, social) | 12–18 GB | 20 GB |
| Normal + daily video | 30–45 GB | 50 GB |
Assumptions and sources
Light 0.20 / normal 0.50 / heavy 0.95 GB per day, plus optional extras, plus about 20% buffer. No live retail prices.
Tet and peak beach months move stays; the data estimate is still GB per day of phone use.
These are planning ranges, not live prices.
Common questions
Is 20 GB enough for 30 days in Vietnam?
Grab, maps and translation sit in normal use. Overnight buses and hauls between Hanoi, Hoi An and HCMC do not by themselves require the heavy setting — video does. The 12–18 GB estimate plus buffer lands on 20 GB. Hotel Wi‑Fi is not counted. Streaming video on mobile is the usual reason to go larger.
Should I roam in Vietnam instead?
Vietnam is outside EU roaming. As of 22 Oct 2026, A1’s Roaming Pass bills €4.90 per started GB there (zone 1) and Drei sells 1 GB for €5 or 5 GB for €10, valid 15 days. Compare that with an eSIM quote for the same GB.
Do you show live Saily prices?
No. Live prices belong on the provider site. The numbers on this page are a data-size estimate only.