Vietnam eSIM: How Much Data You Need (2026)

Your daily rate in Vietnam comes down to one habit: streaming. If you keep to maps and messaging, budget 0.5 GB a day, which is 4 GB across 7 days. If you scroll social media and browse each evening, budget 1.5 GB a day, or 11 GB for the trip, and the 20 GB plan at $27.49 covers the moderate figure. If you stream video or join work calls, budget 3 GB a day and 21 GB in total on the local network your handset finds.

Start with how you use a phone, not with the price list. Vietnam publishes fixed tiers from the 1 GB plan at $3.49 up to the 20 GB plan, and unlimited days from $4.43. The shortest unlimited commitment sold here is 1 day at $4.25. A 7-day moderate trip uses about 11 GB, which the 20 GB plan covers at $27.49. Shapes are not uniform among the five providers we score. Holafly publishes unlimited daily plans across the catalogue. HelloRoam and Airalo publish them for selected destinations only. There is no unlimited option from Nomad and Saily, fixed tiers only. Holafly publishes nothing by the gigabyte, so light users have no small plan to buy.

Light users in Vietnam who check maps, send messages, and browse briefly use about 4 GB over 7 days. The 5 GB plan at $11.09 ($2.22/GB) is the right fit. Moderate users average 1.5 GB a day and need the 20 GB plan at $27.49 ($1.37/GB). Heavy users streaming video or video-calling use 21 GB or more, and the 20 GB plan at $27.49 ($1.37/GB) is the largest tier sold here, so a heavy pace needs a second purchase or an unlimited plan. That is $0.85/GB less than the entry tier charges.

Check three things: the model, the EID and the lock status. iPhone XS (2018) and later, Samsung Galaxy S20 and later, and Google Pixel 3 and later all handle eSIM. Dial *#06# and look for an EID number below the IMEI, which is the line that confirms support. Your phone also has to be carrier-unlocked. Pass all three and Vietnam's 5G network connects on its own once the profile installs, with no SIM tray involved. Some sites write e-SIM, others write e SIM. Same profile either way.

The landing starts it. Nearly every Vietnam plan opens its validity window at the first connection to a local network, not at checkout. That gap is useful: install the QR code at home over WiFi, then let the plan begin when you arrive. The 1 GB plan at $3.49 suits a short stay. The 20 GB plan at $27.49 suits a longer one. Buy 1 to 3 days before departure so a delay or a schedule change cannot burn paid days while the phone is still at home.

Vietnam has 2 mobile networks (Vinaphone, Viettel Mobile) running at 5G, and travel eSIMs route through those same carriers. Coverage holds up in city centres and tourist areas. The 5 GB plan at $11.09 ($2.22/GB) fits a standard Asia visit. Where providers differ is how many countries they sell at all, which decides whether the same account covers your next Asia stop. Destination counts, as each provider states them: Airalo, Nomad and Saily at 200, HelloRoam at 186 and Holafly at 160.

The photo sharer and the navigator both live inside the 1.5 GB moderate band in Vietnam. The streamer and the remote worker both live on the 3 GB heavy band. That is the whole split, and it is the split the tier ladder is built around. The 5 GB plan at $11.09 covers a moderate traveller on the local network your handset finds, at $2.22/GB.

Moderate travelers in Vietnam use 1.5 GB a day, so nights convert straight into a tier: 1 to 2 nights takes the 3 GB plan at $7.49 ($2.50/GB); 3 nights takes the 5 GB plan at $11.09 ($2.22/GB); 4 to 6 nights takes the 10 GB plan at $19.31 ($1.93/GB); 7 to 13 nights takes the 20 GB plan at $27.49 ($1.37/GB). Streamers and remote workers should add 20% before picking. The 20 GB plan holds the lowest per-GB rate here at $1.37/GB. Budget-focused travelers should compare that rate against the tier their nights actually require, because buying a bigger plan for a better per-GB rate stops paying once the extra data goes unused.

You commit to at least 1 day, which costs $4.25 in Vietnam. If your trip runs longer, book the days upfront: the 30-day tier costs $3.63 a day, 18% below the $4.43 base rate. If you extend later instead, you pay the base rate for the extra days. Full 5G speed runs to 2GB a day before fair-use terms apply.

Two things back up a wrong choice, and both are published. The first is the refund window on an unactivated eSIM: HelloRoam and Holafly publish 180 days, Nomad and Saily 30 days and Airalo 14 days. The second is who answers when something needs fixing: HelloRoam publishes support in 63 languages, Airalo 12, Holafly 10, Nomad 2 and Saily 1, and HelloRoam takes live chat, WhatsApp and email, around the clock. Neither helps once the plan is running in Vietnam, so the useful move is to size correctly and buy close to departure. Sizing up first is still cheaper than any refund: the 20 GB plan holds the lowest rate here at $1.37/GB.