Search for the best eSIM for Vietnam and you mostly get affiliate reviews ranking whoever pays the highest commission. This page carries no affiliate links, so the answer can be blunt. For most travelers, a local-carrier eSIM — Viettel, bought through its official app, website or an airport booth — beats every international reseller on price, usually by half or more per gigabyte, and puts you directly on Vietnam's strongest network. International eSIMs from Airalo, Nomad, Saily and Holafly cost more for the same data but win on one real advantage: you buy and install them before you fly, and data works the moment the wheels touch Vietnamese tarmac.
This is the buyer's guide — which option to pick, what each costs as of mid-2026, and the exact setup steps. For carrier coverage maps, 5G speeds, Wi-Fi quality and the rest of Vietnam's connectivity picture, see our Vietnam connectivity atlas; this page deliberately does not repeat that ground.
How the options compare
All prices are hedged bands as of mid-2026 — plans reprice often, so check at purchase.
| Option | Around (10–15GB or equivalent, 15–30 days) | Vietnamese number | Hotspot | Setup friction |
|---|---|---|---|---|
| Viettel tourist eSIM (local carrier) | $8–14 | Usually yes | Yes | Medium — passport registration via app, website or booth |
| Mobifone / Vinaphone tourist eSIM | $6–12 | Usually yes | Yes | Medium — same registration requirement |
| Airalo | ~$20 for 10GB / 30 days | No — data-only | Yes | Low — app purchase, instant QR |
| Nomad | ~$15–25 | No — data-only | Yes | Low — app purchase, instant QR |
| Saily | ~$15–22 | No — data-only | Yes | Low — app purchase, instant QR |
| Holafly | ~$40–65 a month, unlimited | No — data-only | Restricted on many plans | Low — instant QR |
If price decides it, local wins and it is not close. If friction decides it — you want everything done from your sofa the week before the flight — the resellers earn their markup. If you want unlimited data without thinking, Holafly is the only unlimited option on the list, at the cost of hotspot restrictions.
The local-carrier eSIM: cheapest by a wide margin
Viettel is Vietnam's largest carrier with the country's best coverage, and its tourist eSIM packs run around 200,000–350,000 VND ($8–14) for 15–30 days as of mid-2026, many with daily data allowances generous enough to behave like unlimited. There are three ways to buy: the My Viettel app, Viettel's online eSIM store (the QR code arrives by email), or an airport or carrier-shop booth that issues an eSIM instead of plastic. Mobifone and Vinaphone sell equivalent tourist eSIMs at similar or slightly lower prices, and for a city-focused trip any of the three is fine — the connectivity atlas covers when carrier choice actually matters.
Vietnamese law requires passport registration for any local SIM, physical or eSIM. In practice this is a photo upload in the app or a two-minute counter transaction, not an obstacle. The honest catches sit elsewhere: the buying flow is clunkier than the resellers' polished apps, English translations wobble, and foreign cards sometimes fail at online checkout. If the app defeats you, the fallback is simply buying at the airport booth on arrival — still cheaper than any reseller, though airport counters mark up roughly 10–15% over city carrier shops.
International eSIMs: paying for convenience
What Airalo, Holafly, Nomad and Saily sell is not a Vietnamese SIM — it is a travel data plan that roams onto one of the Vietnamese networks through a wholesale agreement. That is why the per-gigabyte price runs two to three times the local rate, and why coverage rides on whichever local partner the reseller uses that quarter. What the markup buys is real: a five-minute purchase with no passport, an English-language app, painless top-ups, and data that connects while you are still taxiing to the gate.
- Airalo — the biggest catalogue and the usual default; around $11.50 for 5GB or $20 for 10GB over 30 days as of mid-2026.
- Nomad — frequently undercuts Airalo on the 10–15GB tiers, at around $15–25; check validity windows, which vary by plan.
- Saily — the newer entrant from the NordVPN family; around $15–22 for 10GB, with a clean app.
- Holafly — unlimited data at around $40–65 a month; the pick for heavy users, but hotspot data is restricted on many plans (commonly a 500MB–1GB daily cap), so it is a poor match for laptop tethering.
All four are data-only. That is fine for Grab, which accepts your home number, but rules out Xanh SM, MoMo and Vietnamese banking OTPs — more on that below.
Setup walkthrough
- Check compatibility before paying. eSIM support plus an unlocked phone — the two checks in the next section. eSIM purchases are often non-refundable once the profile is issued.
- Buy the plan. Reseller app or website, or Viettel's app or online store. You receive a QR code by email or an in-app install button.
- Install on home Wi-Fi, before you fly. On iPhone: Settings > Cellular > Add eSIM. On Android: Settings > Network & internet > SIMs > Add. Label the new line something like Vietnam and leave it switched off. Most plans only start their validity clock at first connection to a Vietnamese network, but a few start on install — check your plan's terms before installing weeks early.
- Activate on landing. Turn the Vietnam line on, set it as your data line, and — the step almost everyone misses — turn on data roaming for that line. Reseller eSIMs are technically roaming products; without that toggle nothing connects. Keep your home SIM enabled for SMS with its own data roaming off.
- If there is still no data, fix the APN. Most profiles configure themselves. A stubborn one needs the provider's APN string entered manually: Settings > Cellular > the Vietnam line > Mobile Data Network on iPhone, or Access Point Names on Android. Every provider publishes its APN on a help page — a 30-second fix. Failing that, toggle airplane mode off and on, or restart the phone.
Total effort: about two minutes of tapping at home and one toggle on arrival.
Device compatibility: the two checks that matter
eSIM hardware. iPhone XR and newer, Google Pixel 3 and newer, and most Samsung flagships from the S20 onward support eSIM. Two traps: iPhones sold in mainland China generally have no eSIM at all, and many budget Android models skip the feature even in 2026 — check your exact model.
Carrier lock. A phone still locked to your home carrier will refuse any foreign eSIM. On iPhone, Settings > General > About should read No SIM Restrictions; on Android, ask your carrier. Phones bought on installment plans are the usual culprits. Request the unlock from your home carrier well before the trip — this is the most common reason a Vietnam eSIM purchase goes to waste.
Keeping WhatsApp and your home number
WhatsApp is tied to the phone number it was registered with, not to whichever SIM is providing data. Keep your home SIM or eSIM installed and active, switch off data roaming on that line only, and WhatsApp continues working over the Vietnamese data line — same number, same chats. Do not delete your home eSIM to free a slot. The same setup keeps banking, airline and booking OTPs flowing, since those arrive as SMS on the home line; receiving texts abroad is free on almost every plan, even though making calls is not.
When a physical SIM still wins
An eSIM is the right call for most visitors, but plastic keeps four honest use cases:
- Long stays. Beyond a month, local renewals at around 100,000–180,000 VND a month beat repurchasing reseller plans.
- You need a Vietnamese number. Xanh SM registration, the MoMo wallet, Vietnamese bank accounts and their OTPs, and many delivery apps require one. Reseller eSIMs never include it; local tourist packs usually do.
- Remote routes. International eSIMs roam via whichever partner network the reseller contracts, while a direct Viettel SIM guarantees the network with the best rural reach — the difference matters on the Ha Giang loop and in the far north, as the connectivity atlas maps in detail.
- Your phone has no eSIM or is locked. Plastic is the only option, and it is a ten-minute passport transaction at an airport booth or carrier shop.
Limitations
- Prices rotate constantly. Reseller plans reprice month to month and run promotions; every figure here is a mid-2026 band, not a quote. Check the live price at purchase.
- Reseller network partners change without notice. Which Vietnamese network Airalo, Nomad, Saily or Holafly rides can shift between quarters, and coverage shifts with it.
- This is a pricing-and-terms comparison, built from provider-published plans and traveler reports as of mid-2026 — not a simultaneous lab test of every provider on every network.
- Viettel's app and checkout experience for foreign cards is inconsistent. A failed online payment is an inconvenience with an easy airport fallback, not a red flag about the product.
- Hotspot policies change frequently, Holafly's in particular. If tethering matters to your trip, confirm the current policy on the provider's own terms page before buying.
- Registration rules can tighten. Vietnam has ratcheted SIM-registration requirements since 2017; expect the passport step to stay and possibly grow, not shrink.
Related reading
- Vietnam connectivity atlas 2026 — coverage maps, 5G speeds, Wi-Fi, ATMs and the full connectivity picture
- Vietnam ATM fees 2026 — per-bank foreign-card charges and how to cut them
- Card versus cash in Vietnam 2026 — where cards actually work
- Noi Bai airport to Hanoi Old Quarter — your first ride once the eSIM connects