| Option | When you get it | Coverage | Who it suits |
|---|---|---|---|
| eSIM | Bought online, delivered in about ten minutes | Viettel nationwide, including Phu Quoc | Trips that move between regions |
| SIM at the airport | A stall after arrival | Depends who you buy from | Handsets without eSIM |
| Roaming from home | Arranged before departure | Whichever partner network | Short trips, minimal usage |
| Hotel wifi only | Nothing to arrange | Gone the moment you step outside | Itineraries that barely leave the hotel |
Vietnam itineraries tend to hop — Hanoi to Da Nang to Ho Chi Minh City, or a flight out to Phu Quoc for island time. What ruins that kind of trip is losing signal every time you change city, so nationwide coverage matters more than a headline speed figure.
One profile from Hanoi to Phu Quoc. No airport queue, and no risk of misplacing the SIM you took out.
See Vietnam eSIM plansHow the two documents depend on each other, the application screens, and the most common reasons applications come back rejected.
Every hop runs on Grab, and Grab needs data. Signal in Hoi An at night, on the cable car, and when to install.
How the north, centre and south differ, so you can decide how to divide your days.
Everything to arrange before departure, including the local apps worth installing.
The three networks compared, with installation walked through step by step.
Signal notes from actually travelling with it, including islands and long transfers.
Dial *#06# and look for an EID. Pick your brand and the checker gives you the exact settings path, plus three caveats that catch people out.
Trip length plus how you actually use your phone, returning a figure with headroom built in rather than the bare minimum.
Full steps for iPhone and Android, when to install, and what to check if it will not connect.
Yes — the day before departure is ideal. Installation needs a stable connection, so do it at home and simply switch mobile data over once you land.
The e-Visa. File PAI afterwards. Do it the other way round and the declaration has no valid visa details to reference, which creates a mismatch. Our e-Visa and PAI guide covers the full sequence.
Viettel covers Phu Quoc and the main town and resort areas are fine. Island-hopping boats and water further from shore will always weaken — that is physics and distance from the nearest cell site, and it applies to every network equally.
Most plans allow it, though it varies by handset and plan and we cannot promise every combination works. Given how much of a Vietnam trip is spent moving, with ride-hailing and maps running, one eSIM per phone is the more dependable setup for a group.
Grab, camera translation of menus and navigating to specific places run more or less continuously. Avoid the smallest tier, go mid-to-upper and prefer a total-allowance plan. The data calculator will give you a number with room to spare.
In order: toggle airplane mode, confirm mobile data is set to the eSIM, confirm data roaming is on, select Viettel manually, then restart. A short delay when you first arrive in a new city or step off a train is normal. If it is still down after that, screenshot it and send it to us on LINE at @peanutmo / WhatsApp +886-921-963-203.
If you are not sure your handset will work, or installation stalls halfway, message us on LINE at @peanutmo / WhatsApp +886-921-963-203. A screenshot of your *#06# result is the fastest way for us to answer. Vietnam eSIM comes with a money-back guarantee, and the QR code reaches your inbox in about ten minutes.
Last updated: 2026-08-03
Phu Quoc lets most travellers in without a visa. Route, costs and where the signal thins out.
Central Vietnam coverage, tested — including the drive over Hai Van Pass.