1Bangkok · Days 1–5
File the digital arrival card before you fly. The river boats are the best transport in the city and the Skytrain covers the rest. Add Chiang Mai or an island if you have the days.
eSIM for ThailandeSIM for Asia
One package across the region, so a multi-country trip is one purchase rather than four. Check the covered list once and stop thinking about borders.
Choose your plan
Every plan below covers the same 21 countries with one shared data allowance.
1 GB7 days2.29€$2.59£1.99CHF 2.193 GB15 days6.09€$6.89£5.29CHF 5.795 GB30 days9.09€$10.99£7.79CHF 8.59Best value10 GB30 days15.99€$18.99£13.99CHF 15.9920 GB30 days27.99€$31.99£23.99CHF 26.99
The allowance is shared across all included countries — it does not reset per country or at borders.
Continue to checkoutWhere it works
21 countries on one package. A few of them:
- Included countries
- One data allowance for the whole package — use it in any mix of the 21 included countries. It is not per country.
- When validity starts
- Your package starts when your phone first connects to a network at the destination — not when you install it. Crossing a border does not restart it.
- Entering another included country
- Your phone picks up a partner network in the new country automatically — keep data roaming on for the onesim line. No settings to change and nothing to reinstall.
- Outside the covered countries
- The package does not connect. Your phone falls back to Wi-Fi or your home SIM if you allow it — check the list before you go, and look at another onesim package for uncovered stops.
- Calls and texts
- onesim is data-only. Calls and messages work over data in apps like WhatsApp or FaceTime; your usual SIM keeps your number.
- Support and refunds
- Message the onesim support team from the app or the website. If a package cannot be installed or used, the refund policy explains what applies. Refund policy
Route idea · Bangkok, Singapore, Tokyo
Three countries, one package.
A first trip across the region that a lot of people do in two to three weeks. Three very different cities, two short flights, one data allowance. The line below is an illustration, not a map.
BangkokDays 1–5
SingaporeDays 6–8
TokyoDays 9–16
1
2Singapore · Days 6–8
Two hours by air. Small enough to walk and hot enough that you will not: the MRT is fast, cheap and air-conditioned. A good place to break a long trip and reset.
eSIM for Singapore
3Tokyo · Days 9–16
Seven hours by air. Base yourself on the Yamanote loop, get a Suica onto your phone before you land if you have an iPhone, and give the second week to Kyoto or the mountains.
eSIM for JapanHow the plan fits this route
One eSIM, one allowance, three countries — as long as each one is on the covered list, which is worth checking before you book, because regional lists are specific. Nothing to switch at an airport, no second installation, and no local SIM registration in a country whose language you do not read.
Before you go
Three things a regional trip needs that a single-country trip does not.
Check the country list, not the region name. "Asia" is a list of specific countries, and the one you assumed was included may not be. The list on this page is the one that counts, and it is checked against what we can actually sell today.
Entry rules are per country and they change. Thailand needs a digital arrival card, several countries run electronic travel authorisations, and a few still want a paper form on the plane. Check each one on its own government site a fortnight before you fly.
Plugs and payment habits vary more than coverage does. Japan is 100V with type A sockets, Thailand and Singapore are different again, and a country can be card-first in its capital and cash-only an hour outside it. A universal adapter and a small amount of local cash covers both.
Reading about Asia plan
Destination guides
The Banana Pancake Trail in 2026: six countries, four weeks, one eSIM
Bangkok, an island, Angkor, Vietnam, Penang, Singapore and Bali: the classic first trip as it runs now, with the border that closed, the forms that arrived and one data plan.
Destination guides
Bangkok for the first time: arrival, transport and three days that work
The digital arrival card you must file before you land, how to get in from either airport for pocket change, and a three-day route that avoids the scams.
Destination guides
Vietnam north to south in two weeks
Hanoi to the Mekong by train and short flights — the 90-day e-visa, the two climates running at once, and the bay worth avoiding the crowds on.
Asia plan questions.
Answers for trips across more than one country.
Open “See covered countries” and search each stop. The list is the authoritative source: if a country is on it, this package works there; if it is not, we point you to another onesim package if one covers it.
No. Validity runs from your first connection in any included country and continues for the plan’s full duration wherever you are on the list.
The package will not connect there. Check whether another onesim package covers that stop, or plan on Wi-Fi for it.
Yes. Your account has one onesim eSIM, and you refill it with any regional package from anywhere in the world — from the website or the app. The new package is added to the eSIM already on your phone; there is nothing to install again.
Not sure which package covers your route?Ask us