Why Hoi An is a connectivity question, not a coverage question
Hoi An is a small town. The Ancient Town is roughly a square kilometre of yellow-walled shophouses, and the beach strip at An Bang and Cua Dai is a ten-minute ride away. All three Vietnamese networks — Viettel, VinaPhone and MobiFone — cover the town well, and 4G is the norm rather than the exception. The question is not "will I have signal?" but "how do I get a working data plan without losing an afternoon to it?"
That is where the choice matters. You can buy a physical SIM on arrival, or you can arrive with an eSIM already installed. Both work. They suit different trips.
eSIM or local SIM: the short version
| Vietnam eSIM (bought before you fly) | Local physical SIM (bought in Vietnam) | |
|---|---|---|
| Where you get it | Online, before departure | Airport counter, carrier shop, phone shop in Hoi An |
| Time cost | None on arrival | 15–40 minutes, plus a passport check |
| Keeps your home number | Yes — dual-SIM, home line stays active | Only if your phone has two physical slots or you use eSIM + SIM |
| Vietnamese phone number | Depends on the plan — some include one, some are data-only | Yes, always |
| Best for | Short trips, late arrivals, anyone who wants to be online at the airport | Stays of two weeks or more, people who need a local number for calls and bookings |
| Price per GB | Usually higher | Usually lower |
If you are weighing this up properly, our guide to which eSIM for Vietnam fits your trip walks through the plan shapes, and Vietnam SIM card: what to know before you buy one covers the physical side, including the registration rules.
Where to buy a SIM card in Hoi An
If you want a physical SIM, you have three realistic options:
- Da Nang airport, on arrival. The counters in the arrivals hall sell tourist SIMs from the three networks. Prices are higher than in town, but it is done in one stop. See Da Nang and Hoi An: SIM, eSIM and getting around for the airport specifics.
- Carrier shops in Hoi An. Viettel, VinaPhone and MobiFone all have official shops in the town. Bring your passport; registration is required by law and the shop will do it for you.
- Phone shops and hotels. Convenient, but you are buying a marked-up tourist SIM and you have less recourse if something goes wrong.
Avoid buying from a street vendor with no shopfront. The SIM may be pre-registered to someone else, which can cause problems later.
Signal in the Ancient Town, on the beach and on the road
In the Ancient Town itself, expect strong 4G on all three networks. The exceptions are predictable: thick brick and timber interiors, some courtyards, and the covered Japanese Bridge area where crowds and masonry both work against you. Step outside and it comes back.
On the An Bang and Cua Dai beach strip, coverage is good and 4G holds. On the road to My Son, signal becomes patchy in the hills and valleys — download an offline map before you go. The Cham Islands are covered but with more variability; if you are diving or staying overnight, do not assume you will stream video.
For a fuller picture of where 5G actually reaches in Vietnam and which bands the networks use, see 5G in Vietnam: which networks, where it reaches and what to expect.
What to set up before you arrive
A short checklist that saves time on the ground:
- Install the eSIM at home, on Wi-Fi. Activation should happen on landing; installation is easier before you travel. Our Vietnam eSIM activation guide covers the install and the common first-connection problems.
- Check your phone supports eSIM. Most recent iPhones and many Android flagships do; some regional models do not. The Vietnam eSIM for iPhone guide covers dual-SIM behaviour and keeping WhatsApp on your home number.
- Download offline maps for Hoi An, Da Nang and the My Son road.
- Install Grab and Zalo before you land — both are useful in Hoi An, and both want a working data connection to set up.
- Decide how much data you need. A week of maps, messaging and the occasional video call is a different plan from a month of remote work. Our how much mobile data guide breaks it down.
If you are staying longer, or working from Hoi An
Hoi An has a large long-stay and remote-work population, and the cafés along the river and in Cam Pho are set up for it. If you are staying a month or more, a local physical SIM on a monthly plan is usually the better value, and a Vietnamese number makes life easier for bookings, deliveries and local calls. Pair it with your home SIM kept active for bank codes — see using two SIMs in Vietnam.
If you are only here for a few days and your priority is arriving online, the eSIM route is simpler and the price difference is small.
A note on "unlimited" plans
Several Vietnam eSIM plans are sold as unlimited. In practice most apply a fair-use threshold, after which speeds drop rather than the data stopping. If you plan to tether a laptop or stream a lot, read the plan terms. Our Vietnam eSIM unlimited guide explains what the thresholds usually look like.
Practical notes for Hoi An specifically
- Power cuts and storms. Central Vietnam has a rainy season from roughly September to December. Brief outages happen; a power bank is worth carrying.
- The Old Town has Wi-Fi in many cafés and restaurants, but it is not a substitute for mobile data if you are moving around.
- Payment apps. Many Hoi An businesses accept QR transfers through Vietnamese banking apps, which need a local number. If you want that, buy a physical SIM.
- Emergency numbers work on any network, SIM or no SIM, as long as you have signal.
The bottom line
For a short trip, buy a Vietnam eSIM before you fly, install it at home, and land connected. For a longer stay, or if you want a Vietnamese number for calls and QR payments, buy a physical SIM from an official carrier shop in Hoi An or at Da Nang airport. Either way, coverage in the town itself will not be your problem — plan for the road to My Son and the islands instead.