eSIM for Thailand & Vietnam

最近更新: 2026-10-09

Thailand and Vietnam: one trip, one eSIM

Thailand and Vietnam are the classic Southeast Asia double-header. Countless itineraries pair them: a few days in Bangkok and Chiang Mai, then a short flight over to Hanoi, Ho Chi Minh City, or Da Nang to add Halong Bay, the old town of Hoi An, or the Mekong Delta. The two are a quick hop apart, budget flights between their major cities are cheap and frequent, and together they make an easy two- to three-week loop through the region.

Connectivity across two countries is where it gets fiddly. Buying a separate local SIM in Bangkok and then another in Ho Chi Minh City means swapping cards, hunting down a shop, and losing your number in between. Roaming on a home plan across both can get expensive fast. A single regional eSIM sidesteps all of that.

The easiest option: one regional eSIM

The cleanest way to stay online across the whole trip is a single Asia eSIM plan. One profile covers both Thailand and Vietnam, so you install it once before you leave, scan the QR code, and it connects automatically in each country — no swapping SIMs at the airport, no per-country setup, and no surprise roaming fees when you touch down in Hanoi.

If your trip leans heavily toward one country — for instance, two weeks in Thailand with just a short side-trip into Vietnam — a single-country plan for your main base is also a fine option. But for a genuine two-country split, one regional plan is the least stressful route: buy once, install once, done. Keep your home SIM in the phone for calls and verification texts, and let the eSIM carry your data.

How much data do you need?

How much you need depends on how you travel. As a rough guide for a 1–2 week Thailand-and-Vietnam trip:

• Light (maps, messaging, the occasional email): around 1–3 GB. Fine if you're mostly on hotel and café WiFi and just need navigation and chat while you're out.
• Moderate (daily browsing, social media, some photo uploads and light streaming): roughly 5–10 GB. This covers most travelers who use their phone normally through the day.
• Heavy (video streaming, hotspot/tethering, lots of uploads, working on the road): 15 GB or more. Size up if you'll tether a laptop or stream regularly.

When unsure, go a little bigger — running maps, ride-hailing apps like Grab, and translation tools across two countries burns through data faster than you'd think.

Quick tips

• Install before you fly. Set up and scan the eSIM QR code while you're on home WiFi, so you land already connected in both countries.
• Turn on data roaming for the eSIM line. On a regional plan this is normal and expected — it's what lets the profile connect to local networks, and it won't trigger your home carrier's roaming charges.
• Keep your primary SIM in the phone. Use it for calls and one-time codes, and let the eSIM handle data across Thailand and Vietnam.
• Check your phone is eSIM-compatible and unlocked before you buy. Most recent iPhones and flagship Android phones support eSIM.

Ready to go? Browse our eSIM plans, pick the Asia option for a Thailand-and-Vietnam trip, and install the QR before you leave home.