eSIM vs local SIM vs international SIM
A travel eSIM is the best all-round choice for most travellers: it is cheap, instant, and needs no swapping. A local SIM can be cheaper per gigabyte for long single-country stays but costs time and effort. An international SIM is convenient across many countries but usually the most expensive per gigabyte of the three.
The three options at a glance
There are three common ways to get mobile data abroad, and they suit different trips. A travel eSIM is a local data plan you install on your phone before or on arrival, with nothing physical to swap. A local SIM is a physical card you buy in the destination, usually the cheapest data per gigabyte but bought in person, often with ID. An international SIM is a single physical card or plan designed to work across many countries, convenient for multi-country trips but priced at a premium for that flexibility.
The quick rule: the eSIM is the best default for almost everyone, the local SIM is for long stays in one country where squeezing the lowest per-gigabyte price is worth the errand, and the international SIM is for travellers crossing many borders who will pay more to avoid managing data in each country. The sections below put real prices behind that, since the gap between them is often smaller than the convenience difference.
Local and international SIMs are physical cards you insert, which means removing your home SIM or using a dual-SIM slot. An eSIM is digital, so your home line stays in place and you switch data lines in settings.
How they compare on price in Asia
On real numbers, the eSIM sets the benchmark. In Asia, eSIM data costs a median of about 1.54 USD per gigabyte as of July 2026 (Drift data), with Thailand around 1.08 USD, Japan around 1.08 USD, and Malaysia around 1.08 USD per gigabyte. A local SIM in Thailand costs roughly 8-15 USD upfront for the card and a starter allowance, after which top-ups are cheap. Spread across a long stay, that local SIM can dip below the eSIM per gigabyte, which is its whole appeal.
The international SIM is the outlier on price. Because one card must work across dozens of countries, providers price the data well above local rates, often several dollars per gigabyte regardless of where you are. You pay that premium for not having to think about which country you are in. For a traveller crossing many borders quickly, that can be worth it; for anyone spending real time in one or two countries, it is usually the most expensive way to buy data of the three, and a regional eSIM covers the same ground for less.
| Option | Data price | Setup | Best for |
|---|---|---|---|
| Travel eSIM | 1.54 USD/GB median (real) | Instant, remote | Almost all trips |
| Local SIM | ~8-15 USD card, cheap top-ups | In person, often ID | Long single-country |
| International SIM | Premium per GB | Order ahead | Many countries fast |
Read the real eSIM rate on the price-per-GB page and the local SIM cost above. If you are in one country a long time, price the local SIM; otherwise the eSIM usually wins on cost once you count the time a physical SIM takes.
The hidden costs: effort and risk
Price is only half the comparison; the effort differs sharply. An eSIM is bought online and installed in minutes, with your home number staying active alongside it. A local SIM means finding an official shop on arrival, often showing ID for registration, swapping out your home SIM, and keeping that small card safe so you can put your home SIM back later. In some countries the cheapest local deals are only at official carrier stores, not airport kiosks, which adds a detour.
There is risk, too. A removed home SIM can be lost, and a local SIM bought from an airport kiosk can carry a tourist markup that erases its price advantage over an eSIM. An international SIM avoids the per-country errand but locks you into premium data rates everywhere. Weighed honestly, the eSIM's slightly higher per-gigabyte price than a local SIM in Asia, around 1.54 USD, often buys back hours of time and removes the swap risk entirely, which is why it is the default for most travellers.
Choosing between the three
Decide by trip shape. Choose a travel eSIM if you want the simplest good-value option, if you are visiting one or two countries for a normal trip length, or if you want your home number to keep working. This covers the large majority of travellers and is the safe default. Choose a local SIM only if you are staying in a single country long enough that the lowest per-gigabyte price outweighs the time, ID, and swap involved, typically several weeks or more.
Choose an international SIM only if you are crossing many countries quickly and value one card that works everywhere over getting the best price in each. For most Asia trips, the eSIM at around 1.54 USD per gigabyte as of July 2026 is the right balance of cost and convenience, with a regional eSIM covering multi-country routes more cheaply than an international SIM. Use the calculator to size your data, then compare the real eSIM rate against a local SIM's upfront cost for your specific stay length.
Frequently asked questions
Is a local SIM cheaper than an eSIM?
Sometimes, for long single-country stays. A local SIM in Thailand costs about 8-15 USD upfront with cheap top-ups, which spread over weeks can beat the eSIM median of 1.54 USD per gigabyte. For shorter trips, the eSIM usually wins once you count the time and effort.
What is an international SIM and is it worth it?
It is a single card or plan that works across many countries. It is convenient for fast multi-country trips but priced at a premium per gigabyte, usually the most expensive of the three options. A regional eSIM covers the same routes for less, so the international SIM suits only constant border-hopping.
Which is best for a normal trip to Asia?
A travel eSIM for almost everyone. It costs a median of about 1.54 USD per gigabyte as of July 2026, installs instantly, and keeps your home number active. Local and international SIMs only win in the narrow cases of very long single-country stays or constant multi-country travel.
Do I lose my home number with an eSIM?
No. An eSIM is digital and runs alongside your home SIM, so your home number stays active for calls and texts while the eSIM handles data. A physical local or international SIM usually requires removing your home SIM unless your phone has a spare slot.
Stop guessing how much data you need
Turn your real habits into a gigabyte figure, then see what it costs at the live median price in your destination.