← Part of the Vietnam money guide
Vietnamchecked Aug 2026StraightforwardStaying connected in Vietnam.
Vietnam has better mobile coverage than most of Europe and charges almost nothing for it. The local SIM is the answer here, and the only real friction is that registration is properly enforced.
At a glance
Coverage
Excellent, the remote north included
Carrier roaming
$10 to $12 a day
Cheapest
A Viettel SIM, $5 to $8
SIM registration
Passport, and it is enforced
Coverage is excellent, and unusually so: strong in the cities, along the whole coast, through the Mekong delta and up into the remote north around Sapa and Ha Giang where you would not expect it. The cheapest option is clearly local. A Viettel or Vinaphone SIM costs about 5 to 8 dollars for a month of generous data, sold at the airports and in phone shops, and registration with your passport is required and enforced, so buy from an official counter rather than a street stall. Your US carrier charges about 10 to 12 dollars a day (AT&T and Verizon day passes), though AT&T caps its Day Pass at 10 daily fees per line per bill period, about 120 dollars, and covers the rest of that bill period on land, so the daily arithmetic stops past day 10, and T-Mobile's mid and upper tiers include 5GB to 30GB of high-speed data abroad before slowing to 256kbps. A Nomad eSIM is a few dollars per gigabyte and suits a regional trip or a late arrival. Never roam pay-per-use, at about 2 dollars a megabyte.
Viettel for a few dollars, on very good coverage
Viettel is the network to want. It has the broadest footprint in Vietnam by a clear margin, including the northern mountains, the Ha Giang loop and rural stretches where other networks fade, and a tourist data package runs about 5 to 8 dollars for a month. Vinaphone is a solid second and Mobifone is fine in the cities. Buy at an airport counter or an official carrier shop in town.
One day of a US carrier day pass costs more than the whole month of local data, and a travel eSIM costs several times it. We earn a commission on eSIMs and nothing on a Viettel SIM, and the honest recommendation for a Vietnam trip is still Viettel.
Registration is real, so buy from an official counter
Vietnam requires every SIM to be registered to an identified person, and unlike some countries that write the rule and shrug, it has run enforcement waves and disconnected unregistered lines in bulk. For a visitor the process is simple: your passport, a few minutes at the counter, and it works. What matters is where you buy.
A SIM sold from a street stall or a market table, already activated and asking for no documents, is registered to somebody else's identity and can be cut off mid-trip. It is a small saving against losing your data on day four in Hue. The airport counters and the official Viettel Store and Vinaphone shops are everywhere and cost the same.
Coverage worth noting, and when to buy something else
The coverage point deserves a line because it is genuinely unusual: Vietnam has invested heavily and you will have a working connection in places that would be dead zones in richer countries, including much of the Ha Giang loop, the Hai Van pass and the delta. The thin spots are deep in the national parks, on some boat routes in Ha Long bay and in the far mountain valleys. The overnight trains hold a signal for most of the route.
On the alternatives: AT&T and Verizon day passes are about 10 to 12 dollars a day and AT&T caps its Day Pass at 10 daily fees per line per bill period, about 120 dollars, and covers the rest of that bill period on land, so the daily arithmetic stops past day 10, and T-Mobile's current tiers include roughly 5GB on Experience More, Magenta MAX and Go5G Plus, 15GB on Experience Beyond and Go5G Next and 30GB on Better Value. A Nomad eSIM is worth it for a multi-country trip or a 1am arrival at Tan Son Nhat, and it is the convenience option rather than the cheap one. This guide is written for US travelers departing the US. For more, see cash or card in Vietnam, taxis and apps in Vietnam, and the Vietnam money guide.
Common questions
Quick answers.
How much is a SIM card in Vietnam?
About 5 to 8 dollars for a month of generous data from Viettel or Vinaphone, sold at the airports and in official carrier shops. You need your passport to register. That is less than one day of US carrier roaming.
Which network is best in Vietnam?
Viettel, by a clear margin on reach. It covers the northern mountains, the Ha Giang loop and rural areas where other networks fade. Vinaphone is a solid second and Mobifone is fine in the cities.
Do I need to register a SIM card in Vietnam?
Yes, with your passport, and it is genuinely enforced. Vietnam has run enforcement waves and disconnected unregistered lines in bulk. Buy from an airport counter or an official carrier shop rather than a street stall, since a pre-activated stall SIM is registered to somebody else and can be cut off mid-trip.
How much does it cost to use my US phone in Vietnam?
About 10 to 12 dollars a day on an AT&T or Verizon day pass, so roughly 70 to 84 dollars a week. AT&T caps its Day Pass at 10 daily fees per line per bill period, so about 120 dollars covers the rest of that bill period on land, while Verizon's TravelPass has no equivalent cap and keeps billing daily. T-Mobile is worth checking first, since its mid and upper tiers include 5GB to 30GB of high-speed data abroad before slowing to 256kbps.
More on Vietnam
The little money things nobody warns you about.
- Do I need cash in Vietnam, or can I use cards?Short answer: cards for hotels and larger purchases, and dong cash for daily life. One quirk to watch: the dong has a lot of zeros, so notes are easy to mix up. Here is how to handle it.
- Tipping in VietnamVietnam has a light tipping culture: not required, but increasingly appreciated in tourist areas. Round up at restaurants, tip guides and spa staff a little, and use small dong notes. Here is what you actually owe.
- Which taxi app to use in Vietnam, and the airport scam to skipThe honest answer is that installing one app before you land makes most of the risk disappear. Here is the app to use, the fake-taxi trick to know, and how to get from the airport into town without the tourist markup.
- Common money scams in Vietnam, and what they cost youVietnam is a wonderful and largely trouble-free trip, and the scams that target tourists are mostly small-value money hustles, not danger: overcharging, sleight of hand and a few transport tricks. They rely on confusion, and a few habits defuse nearly all of them. Here is each one and how to avoid it.
- How do US citizens get a Vietnam e-visa?Short answer: online, on one official government site, before you travel. US citizens need a visa for Vietnam, the e-visa is the easy route, but search results are full of middlemen charging well above the real fee. Here is the official site and the real cost.
- What does getting sick in Vietnam cost a visitor?Vietnam's honest medical geography has three tiers: the international clinics of Hanoi and Ho Chi Minh City for the everyday, local hospitals that stabilise, and then the region's hubs. Beyond the first tier, the serious case is treated in Bangkok or Singapore, so the bill that matters is the flight.
Sources, and how this was checked
Last checkedAug 2026
- T-Mobileinternational roaming pages listing the high-speed data allowance by plan tier
- Verizoninternational travel pages, the TravelPass daily rate and what it includes
- AT&TInternational Day Pass details, the daily rate and the 10-fee cap per bill period
- Viettelprepaid and tourist data package pages
- US State DepartmentVietnam country information for US travelers
Our own readChecked Aug 2026. The two load-bearing points are that Vietnamese coverage is genuinely better than its income level suggests, which is the desk's read from operator maps and consistent traveler accounts, and that SIM registration is enforced rather than nominal, which is why this page tells you where to buy rather than only what to buy. Local package contents shift with promotions, so the 5 to 8 dollar range is the current shape of the offer. We earn on eSIM links and nothing on a Viettel SIM.
How we checkHow every guide is researched, checked and dated