The Vietnam eSIM Matrix by Trip Length: 7, 14 and 30 Days (2026)

A 3-day trip to Vietnam on Viettel's 5G network needs 1.5GB for a light user (maps and messages only), so the 3GB at $7.49 is enough. A moderate user using social media and navigation needs 4 to 5GB, so go with the 5GB at $11.09. Heavy users streaming or video-calling need 10GB or more; buy the largest fixed plan available. For a typical weekend traveler, the 5GB at $11.09 fits most weekend travelers without overpaying for unused data.

Per-day data cost in Vietnam drops as trip length increases. 7 days: 20GB plan at $27.49 total ($3.93/day). 14 days: 50GB plan at $78.63 total ($5.62/day). 30 days: unlimited at $3.01/day (32% off base rate), with full speed for the first 2 GB each day. Moving from 7 to 14 days cuts the daily rate by -43%. The 14-day bracket balances daily rate and flexibility for most travelers visiting Vietnam.

Running low on data in Vietnam? All five providers offer in-app top-ups that land on the profile already installed. Airalo lets you buy additional data through the app in real time, and the top-up lands on the eSIM profile already installed. Unlimited plans are also sold by the day: the 1-day Vietnam plan in the plan table costs $4.43, with full speed for the first 2 GB each day. Saily and Nomad both support fixed-data top-ups with no reinstallation. A top-up of 1GB costs $3.49, the same as buying a new plan. Buying a larger plan upfront is cheaper per GB than topping up, but the option is always available if you underestimate your usage.

Yes, eSIMs work in Vietnam. The network section on this page lists the local operators for Vietnam; the list does not say which one a phone joins. Samsung Galaxy S22 and later, iPhone XS and later, and Google Pixel 4a and later are all compatible. Make sure your device is unlocked from its original carrier, then scan the QR code before you leave home.

No. Travel eSIM data in Vietnam expires at the end of the plan validity window, and unused gigabytes do not carry over to future trips or additional purchases. Buy a plan that matches your actual trip length, not a larger buffer. The 20 GB Vietnam plan at $27.49 lasts 30 days from activation; data left when it ends does not carry over. If you change plans before installing, HelloRoam refunds an unactivated eSIM for 180 days, the same window Holafly gives unused plans, against 14 days at Airalo.

A typical traveler in Vietnam burns through 1 to 2GB per day on maps, messaging, and social media. A 7-day trip needs 7 to 14GB; a 14-day trip needs 14 to 21GB. The 20GB plan at $27.49 fits a week-long trip. Step up to the 50GB plan at $78.63 for two weeks.

The network section on this page lists the local operators for Vietnam; the list does not say which one a phone joins. This site holds no coverage map and runs no speed tests, so it grades no city or rural coverage. Check the network section before choosing a plan for off-the-beaten-path itineraries.

Longer plans in Vietnam cost less per day than shorter ones. A 7-day stay fits the 20GB plan at $27.49 ($3.93/day). A 14-day stay fits the 50GB plan at $78.63 ($5.62/day). Buying one correctly-sized plan costs less than buying two smaller plans back-to-back.

The network section on this page lists the local operators for Vietnam; the list does not say which one a phone joins. 2 of the 3 operators on that list carry a 5G label. A 5G label on that list is a technology label, not a speed. For a full-country itinerary, check the operator list before finalizing your plan.

Fixed data plans fit trips under 8 days in Vietnam. At 1.5GB/day the 20GB plan at $27.49 covers a 7-day trip with data to spare. Unlimited for 7 days costs $27.29, with full speed for the first 2 GB each day, which is comparable to a fixed plan. Switch to unlimited if you stream video daily, work remotely, or use navigation continuously. A 14-day unlimited plan costs $49.62 ($3.54/day), with full speed for the first 2 GB each day.