Best eSIM for Vietnam in 2026: unlimited data, real prices and what to check

Vietnam is an easy country to stay online in. Coverage is dense in Hanoi, Ho Chi Minh City, Da Nang and Hoi An, and 4G reaches most of the coast and the highlands. The real question is not if you will have signal, it is which eSIM you buy before you fly.

This page compares the two ways travelers usually go: a by-GB eSIM, or an unlimited-data eSIM like VoaSim's Vietnam plan. Prices below are the ones you actually pay today.

VoaSim prices for Vietnam (same price for every destination)

There is one price table, whatever the country. No GB tiers to decode, no top-ups mid-trip. Today's prices include the 15% promo:

Trips of 1 to 4 days pay the 5-day package. A second eSIM in the same order (for a travel partner) gets 10% extra off. Maximum 90 days per eSIM. Payment is by international credit or debit card in USD through Stripe, with an invoice by email.

Run your dates in the simulator to see the exact total in about a minute.

Which networks you get in Vietnam

The eSIM is not tied to one operator. On arrival it searches and attaches to a partner network — in Vietnam that means Viettel, Vinaphone or Mobifone, whichever is strongest where you are. Nothing to configure beyond turning the line on.

What that looks like in practice:

• Hanoi and Ho Chi Minh City: solid 4G almost everywhere, including in Grab rides and the metro areas.
• Da Nang and Hoi An: good coverage along the coast and in the Old Town.
• Ha Long Bay: signal is fine near shore and in port towns, but it drops in and out once the boat is well out on the water. Download your maps and boarding info first.
• Sapa, Ha Giang, mountain passes: usable in towns, patchy on remote loops. Offline maps are still worth it.

Connection is 4G, and 5G where a partner network has it available — we do not promise 5G anywhere.

Unlimited vs. by-GB eSIMs: which fits your trip

Most eSIM brands sell Vietnam by the gigabyte. Airalo, Nomad, Saily, Ubigi, Alosim, Jetpac and others work this way, usually through their own app. Holafly sells "unlimited" plans with usage conditions written into its terms. Check each brand's current caps, validity and tethering rules on its own site — we do not quote other companies' prices.

Rough rule: if your phone use in Vietnam is WhatsApp, a few maps lookups and hotel Wi-Fi at night, a small by-GB package is cheaper and perfectly fine. That is an honest answer, not a sales one.

Unlimited makes sense when you stream on night buses, upload photos and video daily, video-call home, work remotely, or travel with someone who uses your phone as the group's map. VoaSim's plan has no data cap, no speed throttling and no hidden fair-use clause — the price you see is the whole cost, whether you use 3 GB or 80 GB. See the wider comparison page if you want the full breakdown.

Today's prices

Today's promo prices (15% off), the same for every destination. Second eSIM in the same order: 10% extra off. Trips of 1-4 days use the 5-day package.

When a local SIM or carrier roaming is the better pick

Vietnamese prepaid SIMs are genuinely cheap and easy to find at Noi Bai, Tan Son Nhat and Da Nang airports. They can beat any eSIM on price for very long stays — months, not weeks — and they give you a local phone number, which helps if a landlord, a bank or a delivery app needs to SMS you.

The trade-offs: you need shop time on arrival, passport registration is required, and your own SIM comes out of the phone, so your home number and its SMS codes go quiet. If your device is a single-SIM phone with no eSIM slot, that is your only route anyway.

Carrier roaming (T-Mobile, AT&T International Day Pass, Verizon TravelPass, EE, Vodafone, Telstra, Rogers and similar) is the zero-effort option: keep your number, nothing to install. It is usually billed per day of use or bundled with reduced speeds after a daily allowance, and rates change by country and plan — open your carrier app and check Vietnam's current rate before you decide. See how roaming compares.

Before you fly: compatibility and install

You need an unlocked phone with eSIM support. That means roughly iPhone XR or newer, Samsung Galaxy S20 or newer, Google Pixel 3 or newer, and most phones launched from 2020 on. Universal test: dial *#06# — if an EID number appears, you have eSIM. If your phone is locked to a carrier, get it unlocked first. VoaSim does not sell physical SIM cards.

The QR code arrives by email within minutes of payment (plus a WhatsApp heads-up if you left a number at checkout). Install it at home, on your own Wi-Fi, following the iPhone or Android guide we send.

One rule matters: your days start at the eSIM's first connection to a network in Vietnam, not at purchase. So install before the flight but leave the eSIM line switched off — on Android, do not enable its mobile data until you land. Your physical SIM keeps working and WhatsApp stays on your usual number; just turn off your home carrier's data roaming.

Landing in Vietnam: the two-minute setup

After the plane doors open:

1. Turn off airplane mode.
2. In settings, switch the VoaSim eSIM line on and set it as your mobile data line.
3. Confirm data roaming is on for the eSIM line and off for your home SIM.
4. Wait one or two minutes for a Vietnamese network to register, then load a page.

If nothing comes through, restart the phone once — that fixes most cases. Still stuck? Run our free eSIM Rescue diagnostic, which works on any brand of eSIM, or message support at hola@voasim.com or through the on-site chat. Real people answer. If the eSIM will not connect and support cannot fix it, you get a 100% refund.

Tethering is worth one warning: whether hotspot works depends on the plan, so ask support before you build your trip around sharing data with a laptop.

FAQ