For a one-to-two week trip where you're sightseeing, navigating and messaging — and using cafe and hotel wifi like most visitors do — around 5GB is genuinely enough. Push past that only if you stream video on mobile data, scroll Reels for hours on buses, video call home daily, or tether a laptop; those habits can double or triple your usage and put you nearer 10–15GB. Navigation, the thing most people worry about, is almost never what drains a plan.
Most people buy too much data for Vietnam, and it's usually for the wrong reason. The fear is always navigation — that a fortnight of Google Maps will chew through an allowance — when in reality maps are one of the cheapest things your phone does. The real damage comes from habits nobody thinks to budget for.
The useful way to size a plan isn't to pick a tier off a provider's page. It's to work out roughly what your actual days will look like, price the handful of activities that genuinely cost something, and account for how much of it will happen on wifi. Here's what the numbers look like.
Maps use far less than you'd expect
Standard turn-by-turn navigation in Google Maps runs somewhere around 3–5MB per hour. Travelling abroad pushes that up, since the app is downloading map areas it has never cached before — call it 10–30MB per hour in practice on a trip.
Even at the pessimistic end, that's tiny. Three hours of navigating a day for two weeks lands you somewhere near 1GB total, and most travellers navigate nothing like that much — you're walking a district, not driving cross-country.
There are two exceptions worth knowing, because they break the rule badly. Satellite view can hit 100MB in an hour, and Google's 3D immersive view runs at roughly 10MB a minute, which is around 600MB an hour. Both are easy to leave switched on by accident. Standard map view costs you almost nothing; the fancy ones cost more than streaming.
What actually drains a plan
Video is the whole story. A WhatsApp video call runs around 300MB an hour, closer to 480MB if the connection is strong enough for HD. Call family for half an hour every evening for a fortnight and you've spent roughly 2GB on that habit alone.
Social media is worse, because it's passive and you lose track of it. Scrolling a plain Instagram feed is a fairly modest 100–200MB per hour, but Reels are in a different league at somewhere between 600MB and 1.2GB an hour. An hour of Reels can cost more than your entire fortnight of navigation.
Streaming sits in similar territory. YouTube at 360p is about 300MB an hour, roughly 1GB an hour at 720p, and anywhere from 1.5–3GB an hour at 1080p. A single long bus ride from Hanoi to Ninh Binh with video playing at default quality can quietly account for a quarter of a 5GB plan.
Messaging, email, ride-hailing apps and looking things up barely register against any of this. If you never open a video, it's genuinely hard to spend much.
Vietnam's wifi does more of the work than you'd think
This is the part that changes the maths, and it's why generic travel-data advice tends to overshoot for Vietnam specifically. Free wifi here is close to universal in the places travellers spend time — cafes, restaurants, and hotels and hostels at every price level. Coffee culture is enormous, and chains like Highland Coffee, The Coffee House and Cong Ca Phe are set up for people sitting with laptops for hours.
Practically, that means the expensive activities tend to land on wifi anyway. You call home from the hotel, not the back of a Grab. You catch up on video in a cafe over an iced coffee. Plenty of travellers report getting through a Vietnam trip on wifi alone, without buying any data at all — which isn't a plan we'd recommend, but it tells you how available the connection is.
The caveat is geography. Coverage and quality thin out in rural areas, the northern trekking regions and remote islands, and busy public networks slow down at peak times. If your itinerary is city-and-coast, wifi will carry a lot of your load. If you're heading for Ha Giang or Sapa, lean on your mobile allowance more.
So what number should you actually buy?
Typical travellers land somewhere between 500MB and 2GB a day when abroad, and lighter sightseeing days sit nearer 400–600MB. Vietnam's wifi availability pulls most people toward the bottom of that band rather than the top.
Run it out and a light-to-moderate two-week trip — maps, messaging, ride-hailing, some browsing, video kept mostly to wifi — comes in around 5GB. A long weekend on the same habits needs more like 2–3GB. If you're a heavy mobile user who streams on the move, posts video daily, or tethers a laptop for work, you're realistically looking at 10–15GB or an unlimited plan for the same fortnight.
It's worth knowing that the standard advice circulating online skews high — a lot of it is published by companies selling data plans, and the widely repeated "7–10GB for one to two weeks" figure assumes you're on mobile data all day with no wifi to fall back on. In Vietnam that assumption doesn't hold particularly well.
Two things that blow a budget without warning
Tethering is the big one. The moment a laptop joins your phone's hotspot it behaves nothing like a phone — background sync, cloud backups, software updates and video calls at full quality. A single afternoon of working off a hotspot can cost more than several days of ordinary phone use. If you plan to work at all, size your plan for that specifically or commit to doing it on cafe wifi.
The other is autoplay. Video that starts by itself in a social feed spends your allowance while you're not even watching, and it's the single easiest thing to switch off. Between autoplay, HD upload quality and background app refresh, most people can cut their usage meaningfully in about two minutes of settings changes.
Before you buy a bigger plan than you need
If the sums above put you in the ordinary-traveller bracket — a week or two, cities and coast, video mostly on wifi — you don't need a large plan, and there's a reasonable chance you don't need to pay for one at all. LocalPay currently includes a free 5GB Vietnam eSIM when you sign up, which is right at the number this arithmetic keeps landing on for a typical trip.
It's a sensible starting point precisely because 5GB is the honest answer for most people rather than an upsell. And since the app is a QR payments wallet built for Vietnam, Indonesia and the Philippines, it also deals with the other thing every visitor has to sort out — paying at the cafes, markets and street stalls that take local QR codes but won't touch a foreign card.
If you already know you're in the heavy-use category, buy accordingly — a free 5GB bundle is a poor fit for someone tethering a laptop daily. But a lot of travellers pay for 10GB or 20GB, come home having used three, and could have skipped the purchase entirely.
Get the free 5GB eSIM“An hour of Instagram Reels can cost you more data than an entire fortnight of navigation.”
Cutting your usage without noticing the difference
- Download offline maps for your cities before you fly — navigation then costs essentially nothing.
- Keep Google Maps in standard view; satellite runs about 100MB an hour and 3D immersive around 600MB.
- Turn off video autoplay in Instagram, Facebook and X — it spends data on things you never chose to watch.
- Drop YouTube to 480p on mobile data; the difference on a phone screen is marginal, the saving is not.
- Save video calls home for hotel or cafe wifi, which in Vietnam is rarely more than a few minutes away.
- Budget separately for tethering — a laptop on your hotspot uses data at a completely different rate.
The short version: navigation is cheap, video is expensive, and Vietnam's wifi absorbs a surprising amount of the expensive part. Size your plan around how much video you'll watch away from wifi and whether you'll tether — not around how much you'll use maps.
For most people that means a smaller plan than the one they were about to buy. Work out your number before you pay for a tier you'll never touch.
Frequently asked questions
For most travellers, yes. If you're sightseeing, navigating, messaging and using ride-hailing apps while doing video calls and streaming on wifi, 5GB comfortably covers a two-week trip. It won't be enough if you stream on mobile data regularly, scroll Reels for hours, or tether a laptop.
Standard navigation uses roughly 3–5MB per hour, rising to around 10–30MB per hour abroad as the app downloads unfamiliar map areas. Satellite view is far heavier at 100MB or more per hour, and 3D immersive view can reach around 600MB per hour.
Video, in every form. YouTube runs about 1GB per hour at 720p, Instagram Reels between 600MB and 1.2GB per hour, and WhatsApp video calls around 300MB per hour. Maps, messaging and browsing are trivial by comparison.
You could, and some travellers do — free wifi is near-universal in Vietnamese cafes, restaurants and accommodation. It's not advisable as your only plan, though, since you'll want maps and ride-hailing between those places, and coverage thins out in rural and mountainous areas.
Around 2–3GB is plenty for three or four days of ordinary sightseeing use, assuming video and calls happen mainly on wifi.
Some apps bundle one rather than selling it. LocalPay currently includes a free 5GB Vietnam eSIM with signup alongside its QR payments wallet, which suits a typical one-to-two week trip.
