Southeast Asia eSIM Trip Pack 2026: Thailand + Vietnam + Cambodia for 2-3 Weeks
The 2-3 week SEA loop most EU travellers actually book — Bangkok → Siem Reap → Hanoi/Ho Chi Minh. One eSIM per country beats a global roaming plan, costs about US$25–35 total, and each plan auto-refunds if you don't use it. Plus what to buy for a tour-operator bundle.
Published August 12, 2026·6 min read
30-day auto-refund on no usageSummary
For the 2-3 week Bangkok → Siem Reap → Hanoi/Ho Chi Minh loop most European and North American travellers actually book: three single-country eSIMs beat any global roaming plan and any regional multi-country SIM on both price and speed. Total: about US$25-35 for 5-10 GB per country, each riding the top domestic carrier. Unused plans auto-refund at 30 days.
The 2-3 week SEA loop
Most European travellers heading to Southeast Asia for a proper 2-3 week trip end up on some version of this route: fly into Bangkok (BKK) for 3-5 days of temples, food, and acclimating; overland or short-hop to Siem Reap (REP) for 2-3 days of Angkor; then Hanoi (HAN) or Ho Chi Minh City (SGN) for the final week of Vietnam coast, motorbikes, and coffee. Each country is a different mobile carrier world — one eSIM per country is the right shape.
What to buy — the trip pack
| Leg | Days | Data to buy | Typical price | Network |
|---|---|---|---|---|
| Thailand | 3-7 | 10 GB / 30 days | ~US$8-12 | AIS / True 4G-5G |
| Cambodia | 2-3 | 5 GB / 30 days | ~US$6-9 | Smart / Cellcard 4G |
| Vietnam | 5-10 | 15 GB / 30 days | ~US$11-15 | Viettel / Vinaphone 4G-5G |
Total: US$25-36 for the pack. Buy each plan below, install all three QRs at home on Wi-Fi before you fly, and switch the data line as you cross each border.
Why not a single regional Asia plan?
Regional multi-country plans (the ones marketed as "Asia 20GB") route traffic through whichever partner network they've contracted in each country. Two consistent trade-offs: lower carrier priority (traffic slows when the local network is congested — evenings in Bangkok, weekends in Hanoi) and higher price per GB (a typical regional 20GB plan is US$45-55 vs the US$25-36 pack above for 30 GB total). The trade you get: one QR instead of three. If that's worth US$20+ to you, buy the regional plan; if not, the pack wins.
Auto-refund makes over-buying safe
Every YonoSIM eSIM in the pack is covered by the 30-day no-usage auto-refund. Weather cancels the Cambodia leg? The Cambodia eSIM refunds automatically at 30 days — no support ticket, no email, no proof required. It removes the anxiety of buying "the right amount" for a trip you don't yet know the shape of, and it's why we can recommend sizing up when uncertain.
For tour operators & travel businesses
If you run a small tour company that sells 2-3 week Asia loops — this trip pack is a plug-in upgrade to what you already deliver. Your client lands in Bangkok, opens their email, taps three QR codes, and never deals with airport SIM counters, roaming charges, or lost connectivity between cities. We can arrange bulk QR delivery and a per-tour billing setup on request. See YonoSIM for tour operators for details.
FAQ
QShould I buy one regional Asia eSIM or three country eSIMs?
AFor a 2-3 week Thailand + Vietnam + Cambodia trip, three single-country eSIMs almost always win on both price and speed. Regional plans typically hop through partner networks with lower priority, and per-GB pricing runs higher. Three local eSIMs ride the top domestic carrier in each country (AIS in Thailand, Viettel in Vietnam, Smart in Cambodia) — full 4G/5G on the same towers a local uses.
QHow much data do I need for a 2-week Southeast Asia trip?
A5–10 GB per country is comfortable for a typical mix of maps, Grab, WhatsApp, translation apps, and social. Heavier streamers, hotspot users, or anyone working on the road should size up to 20 GB per country or pick unlimited-daily plans. On YonoSIM, unused eSIMs auto-refund at 30 days — buying a bit more than you think you'll need is risk-free.
QCan I keep my home number active while using these eSIMs?
AYes. All three eSIMs are data-only, installed as a second line alongside your home SIM. Your home number stays active for iMessage, WhatsApp, and SMS 2FA codes on Wi-Fi Calling — see the guides linked at the bottom. You just switch the data line to the travel eSIM in each country.
QI run a small tour operator — can I bundle these into my client packages?
AYes, and it's the fastest connectivity upgrade you can offer a 2-3 week Asia tour without changing your booking flow. Send us a note and we'll set up bulk QR delivery and a per-tour billing arrangement — client hands over an email, we deliver the three activation QRs sized to the trip, they land in Bangkok with data on.
QDoes the auto-refund cover trip-pack plans too?
AYes — every YonoSIM eSIM (single-country or bundled into a trip pack) is covered by the 30-day no-usage auto-refund. If you finish the trip and one country's plan went untouched (weather cancelled the Cambodia leg, for example), the refund happens automatically. No support ticket, no email.