Around 5GB genuinely covers a one-to-two week trip for anyone sightseeing, finding their way around and messaging, provided video calls and streaming mostly happen on the cafe and hotel wifi that's everywhere in Vietnam. You'll want 10–15GB or an unlimited plan instead if you watch video on mobile data, spend long journeys on Reels, call home every night, or run a laptop off your hotspot. Maps — the usual worry — hardly dent an allowance at all.
Travellers routinely overbuy data for Vietnam, and almost always because they're worried about the wrong thing. Everyone frets about two weeks of Google Maps eating an allowance, when navigation is among the least demanding things a phone does. The genuine cost sits in habits that never make it onto anyone's mental checklist.
A better approach than picking a tier from a provider's pricing page: sketch what your days will realistically involve, put a number on the few activities that actually cost something, then discount for everything you'll do on wifi. The figures below make that straightforward.
Navigation barely registers
Ordinary turn-by-turn directions in Google Maps consume roughly 3–5MB per hour. That figure rises overseas because the app is pulling down map areas it hasn't stored before, so budget nearer 10–30MB per hour while you're travelling.
Even taking the higher end seriously, it's negligible. Navigating three hours daily across a fortnight totals somewhere around 1GB — and hardly anyone navigates that heavily on holiday, since you're generally exploring a neighbourhood rather than covering distance.
Two settings break this rule dramatically, though. Satellite view can burn through 100MB in a single hour, while Google's 3D immersive view consumes about 10MB per minute — roughly 600MB hourly. Either is simple to leave running unintentionally. Plain map view is effectively free; the visually impressive modes cost more than watching video.
Where your allowance really goes
It's video, more or less exclusively. A WhatsApp video call consumes around 300MB hourly, rising toward 480MB when the signal supports HD. Half an hour of catching up with family each evening across two weeks works out at something like 2GB spent on that one routine.
Social feeds do more damage still, mostly because the consumption is passive and impossible to track by feel. Ordinary Instagram feed scrolling is a manageable 100–200MB per hour, but Reels operate on another scale entirely — roughly 600MB to 1.2GB hourly. One hour of that outweighs a fortnight's worth of directions.
Streaming behaves similarly. YouTube consumes about 300MB hourly at 360p, around 1GB at 720p, and between 1.5GB and 3GB at 1080p. Spend one long coach journey with video running at whatever quality it defaulted to and you may have written off a quarter of a 5GB allowance without noticing.
Meanwhile texting, email, booking rides and general looking-things-up are rounding errors next to any of the above. Avoid video altogether and spending significant data becomes genuinely difficult.
Wifi in Vietnam covers more ground than generic advice assumes
Here's the factor that shifts the calculation, and why data guidance written for travel in general tends to overshoot for Vietnam in particular. Free wifi is effectively everywhere travellers congregate — cafes, restaurants, and accommodation from hostels through to high-end hotels. The country's coffee culture is vast, and chains such as Highland Coffee, The Coffee House and Cong Ca Phe expect customers to settle in with a laptop for hours.
In practice this means your costly activities naturally migrate to wifi. The call home happens from your room rather than a Grab back seat. The video backlog gets cleared in a cafe over a ca phe sua da. Some travellers get through entire Vietnam trips on wifi alone without buying data at all — not something to plan around, but a fair indication of how accessible it is.
Geography is the qualifier. Both availability and speed drop off in rural districts, the northern trekking areas and offshore islands, and shared public networks bog down at busy times. An itinerary built around cities and the coastline will lean heavily on wifi; one heading for Sapa or the Ha Giang Loop should lean on mobile data instead.
Putting a number on it
Travellers abroad generally land between 500MB and 2GB daily, with relaxed sightseeing days closer to 400–600MB. Vietnam's wifi saturation tends to drag most visitors toward the lower end of that range rather than the upper.
Extend that across a trip and a moderate fortnight — directions, messages, ride-hailing, casual browsing, video largely reserved for wifi — totals somewhere near 5GB. Three or four days on the same pattern needs roughly 2–3GB. Someone streaming on the move, uploading video daily or running a laptop through their hotspot should budget more like 10–15GB across two weeks, or simply take an unlimited plan.
Worth bearing in mind: the guidance you'll find most often online leans generous, and much of it is published by businesses selling data bundles. The frequently quoted "7–10GB for one to two weeks" presumes mobile data carrying your entire day with no wifi backstop — an assumption that fits Vietnam poorly.
The two costs nobody plans for
Tethering tops the list. Connect a laptop to your phone's hotspot and it consumes data on a completely different scale to a phone — cloud syncing, backups, OS updates and full-quality video calls all resume as though you were on home broadband. One working afternoon on a hotspot can exceed several days of normal phone use. Anyone planning to work should either size their plan around that explicitly or resolve to do it on cafe wifi.
Autoplay is the other. Video that launches on its own as you scroll spends your allowance on content you never chose to watch. Turning it off, along with HD upload quality and background refresh, takes roughly two minutes and cuts most people's consumption appreciably.
Think twice before paying for a larger plan
If the arithmetic above puts you in the ordinary-visitor category — a week or two, cities and coastline, video mainly on wifi — a big plan is unnecessary, and quite possibly any paid plan is. LocalPay is currently including a free 5GB Vietnam eSIM with signup, which lands almost exactly on the figure this calculation keeps producing for a standard trip.
That makes it a sound default rather than a sales pitch, since 5GB happens to be the truthful answer for the majority of travellers. And because the app is fundamentally a QR payments wallet spanning Vietnam, Indonesia and the Philippines, it simultaneously resolves the other universal arrival problem — settling up at cafes, markets and street vendors that scan local QR codes but reject foreign cards.
If you already recognise yourself as a heavy user, buy for that instead; a free 5GB allowance suits nobody who tethers a laptop daily. But plenty of people pay for 10GB or 20GB, return home having consumed three, and needn't have bought anything at all.
Get the free 5GB eSIM“A single hour of Instagram Reels can burn more data than two solid weeks of navigation.”
Easy savings you won't feel
- Save offline maps of your destinations before departure — navigation then costs virtually nothing.
- Stay in Google Maps' standard view; satellite runs around 100MB an hour and 3D immersive closer to 600MB.
- Switch off autoplay across Instagram, Facebook and X so nothing streams unless you choose it.
- Cap YouTube at 480p on mobile data — barely noticeable on a phone, substantially cheaper.
- Keep video calls for hotel or cafe wifi, which in Vietnam is almost always within walking distance.
- Treat tethering as its own line item — laptops consume data at a completely different rate to phones.
Boiled down: directions are cheap, video is costly, and Vietnam's wifi soaks up a great deal of the costly part. Base your plan size on how much video you'll consume away from wifi and whether a laptop is joining your hotspot — not on how often you'll open a map.
For most travellers that points to a smaller plan than the one they were reaching for. Do the sums before paying for capacity you'll never reach.
Frequently asked questions
For the majority of visitors, yes. Sightseeing, navigating, messaging and ride-hailing while keeping streaming and video calls on wifi fits inside 5GB across a fortnight without difficulty. It falls short if you regularly stream on mobile data, spend hours on Reels, or tether a laptop.
Expect roughly 3–5MB per hour for standard navigation, climbing to about 10–30MB per hour overseas while the app caches unfamiliar areas. Satellite view is considerably heavier at 100MB or more hourly, and 3D immersive view approaches 600MB an hour.
Anything video-based. YouTube uses roughly 1GB per hour at 720p, Instagram Reels between 600MB and 1.2GB per hour, and WhatsApp video calls about 300MB per hour. Directions, messaging and browsing are insignificant beside them.
It's possible, and some travellers manage it — free wifi is near-ubiquitous in Vietnamese cafes, restaurants and places to stay. It's a risky sole strategy though, since you'll want maps and ride-hailing while moving between those places, and rural and mountainous regions are far less well served.
Roughly 2–3GB handles three or four days of typical sightseeing, on the assumption that calls and streaming happen largely over wifi.
A few apps bundle it rather than charging for it. LocalPay currently provides a free 5GB Vietnam eSIM on signup alongside its QR payments wallet, which fits a typical one-to-two week visit.
