Guide · Mobile data
eSIM for Asia travel: how it works and how to choose
Check your phone, install before you fly, switch on when you land. Then which store covers which country, and what to do when the data will not connect.
Updated · Checked against official sources
A travel eSIM is a SIM profile you download to your phone, usually by scanning a QR code, that gives you mobile data abroad without swapping the physical SIM card. It works if your phone supports eSIM and is not locked to your home carrier; install it on Wi-Fi before you fly, then switch it on and allow data roaming for it when you land.
What is an eSIM, and how is it different from a SIM card?
Short answer: an eSIM is a SIM built into the phone that you program by downloading a profile, instead of inserting a plastic card. A travel eSIM adds a second line for data while your home SIM stays in place.
Most eSIM phones can hold several profiles and use two lines at once: typically your home number for calls and texts, and the travel eSIM for mobile data. Nothing has to be removed, so you cannot lose your home SIM card in a hotel room, and you do not need to find a SIM counter or shop after landing.
| Option | Good for | Watch out for |
|---|---|---|
| Travel eSIM (data only) | Data from the moment you land; several countries on one trip; keeping your home number active | Needs an eSIM-capable, unlocked phone; no local number |
| Local physical SIM | A local phone number; long stays | Buying it after arrival; swapping out your home SIM |
| Your carrier's roaming | No setup at all | Daily or per-MB charges set by your home carrier |
Will a travel eSIM work on my phone?
Short answer: it will if your phone model supports eSIM and your carrier has not locked the phone. Check both before you buy; an eSIM cannot be moved to a phone that rejects it.
How do I check on an iPhone?
- Open Settings > General > About.
- Find Carrier Lock. "No SIM restrictions" means the phone is unlocked.
- On the same screen, an EID number (or a Digital SIM entry) shows the phone has eSIM hardware.
How do I check on Android?
- Dial *#06#. If an EID appears alongside the IMEI numbers, the phone supports eSIM.
- Look in the SIM settings (for example Settings > Connections > SIM manager on Samsung, or Settings > Network & internet > SIMs on Pixel) for an option to add an eSIM.
- For the carrier lock, ask your carrier, or test a SIM card from another network: if it connects, the phone is unlocked.
Menu names vary by model and software version. If a phone was bought on a contract, assume it may be locked until you have checked.
When should I install and activate a travel eSIM?
Short answer: install it at home on Wi-Fi a day or two before you fly, and activate it when you land by switching the eSIM line on, choosing it for mobile data and turning on data roaming for it.
Installing needs an internet connection, so doing it at home avoids hunting for airport Wi-Fi. On the stores listed below, installing early does not use up your plan: validity starts at the first connection in the destination country. Keep the eSIM profile on the phone until the trip is over, because a QR code is often valid for one installation only; ask the seller before deleting and reinstalling.
- Label the lines (for example "Home" and "Travel") so you can tell them apart in the settings.
- Set the travel line for mobile data, and keep the home line for calls and text messages if you need them.
- Turn data roaming on for the travel line and off for the home line.
Do I need a local phone number, or is data enough?
Short answer: for maps, messaging apps and ride-hailing, data is enough, and WhatsApp or LINE keep working with your usual account. You need a local number only for services that send one-time passwords to local numbers.
One example in Thailand: registering a drone requires a Thai SIM card because the registration portal sends a one-time password to a Thai number. Some apps avoid the problem: the Smile Taxi Service booking app, for instance, logs you in with a code sent by email, so no Thai number is needed. If your bank sends security codes by text message, keep your home SIM active; your carrier may charge for texts received while roaming.
Which eSIM should I buy for each country in Asia?
Short answer: the ten country stores below sell data-only eSIMs for one destination (and regional plans that include it), paid once by PayPal, with the QR code sent by email.
| Country | eSIM store | Networks listed | Coverage note from the store |
|---|---|---|---|
| Thailand | Thai eSIM | AIS, TrueMove H, dtac | 5G in Bangkok, Phuket, Chiang Mai and Pattaya on supported plans; 4G/LTE nationwide |
| Japan | Japan eSIM | NTT docomo, KDDI (au), SoftBank | 5G in Tokyo, Osaka, Kyoto and other cities; 4G/LTE nationwide |
| South Korea | Korea eSIM | SK Telecom, LG U+ | 5G in Seoul, Busan and other major cities; LTE nationwide |
| Vietnam | Vietnam eSIM | Viettel, MobiFone, Vinaphone | 5G in Hanoi, Ho Chi Minh City and Da Nang on supported plans; 4G/LTE nationwide |
| Taiwan | Taiwan eSIM | Chunghwa Telecom, Taiwan Mobile | Regional and global plans that include Taiwan (no Taiwan-only plans listed) |
| Hong Kong | Hong Kong eSIM | csl, SmarTone | 5G across Hong Kong Island and Kowloon; 4G/LTE throughout the territory |
| Singapore | Singapore eSIM | Singtel, StarHub, M1 | 5G across the island; regional plans also cover Malaysia and Indonesia |
| Malaysia | Malaysia eSIM | Maxis, CelcomDigi | 5G in Kuala Lumpur, Penang, Johor Bahru and other cities; 4G/LTE nationwide |
| Philippines | Philippines eSIM | Globe, Smart | 5G in Metro Manila, Cebu and Davao on supported plans; 4G/LTE across the main islands |
| Indonesia | Indonesia eSIM | Telkomsel, Indosat, XL Axiata, Smartfren | 4G/LTE across Bali, Java and the main islands; 5G in selected cities on supported plans |
Plans, prices and validity options change often and are shown live on each store. For other countries, the parent store eSIM Hub sells travel eSIMs for many more destinations. Country basics (plugs, currency, emergency numbers) are on the Asia destinations page.
Should I buy one regional eSIM or a separate eSIM for each country?
Short answer: for two or more countries on one trip, a regional plan means one installation and no switching at borders; for a single country, a country plan is the simpler choice. Compare data allowance and validity against your actual route.
- One country, one to four weeks: a country plan sized to your stay; add data with a top-up if the plan offers one.
- Several countries in a row (for example Singapore, Malaysia and Indonesia): a regional plan that names every country on your route.
- Taiwan: the Taiwan store sells only regional and global plans that include Taiwan, so check that the plan lists it.
My eSIM is installed but has no data. What should I check?
Short answer: in most cases data roaming is off for the eSIM line, or the phone is still using the home line for data. Check those two settings first, then restart the phone.
- Line on: the travel eSIM is switched on and selected as the line for mobile data.
- Data roaming on for the travel line; the stores listed here require it.
- Home line off for data: turn off its data roaming, and on iPhone turn off "Allow Mobile Data Switching" so the phone does not fall back to it.
- APN: if the installation instructions give an APN (access point name), enter it in the mobile network settings for the travel line.
- Network: switch network selection to manual and pick one of the networks the store lists, then restart the phone.
- Still nothing: use the store's contact page, which has installation guides and troubleshooting; have your order email ready.
Landing in Thailand with a Smile Taxi Service transfer? The regional booking sites give a free 500 MB eSIM with an airport pickup, on request. For everything else about arriving in Thailand, see the Thailand Q&A and the airport transfer answers.
Transparency: the eSIM stores listed on this page (the ten country stores and eSIM Hub) and Smile Taxi Service are affiliated with Asia Travel Forum. What we say about them comes from their published store information and terms.
Frequently asked questions
Can I keep using WhatsApp with a data-only eSIM?
Yes. WhatsApp, LINE and similar apps are tied to the account you already have, so they keep working over the eSIM's data and your contacts still see your usual number. Only services that text a code to a local number need a local SIM.
When does the eSIM's validity period start?
On the ten country stores listed here, at the first connection in the destination country, not when you buy or install. That is why you can install at home a few days before the flight.
Will I still receive my bank's text messages abroad?
Only if your home SIM stays switched on. Keep it active for calls and texts but turn off its data roaming; ask your carrier whether it charges for texts received while roaming.
What if my phone is locked to my carrier?
A locked phone will not accept another network's eSIM. Ask your carrier to unlock it before the trip; if that is not possible, your options are the carrier's own roaming plan or a separate unlocked device.
Can I install the eSIM after I land?
Yes, if you can get online, for example on airport Wi-Fi, because the download needs a connection. Installing at home first is easier and does not start the plan early on the stores listed here.
Does one eSIM work in several Asian countries?
Regional plans do: they cover a named set of countries, and the Singapore store's regional plans, for example, also cover Malaysia and Indonesia. Check that every country on your route appears in the plan before you buy.
Sources
- Store information published by Thai eSIM, Japan eSIM, Korea eSIM, Vietnam eSIM, Taiwan eSIM, Hong Kong eSIM, Singapore eSIM, Malaysia eSIM, Philippines eSIM and Indonesia eSIM (networks, coverage, activation, compatibility and payment), checked 27 Sep 2026
- Important things to know before using drones — Civil Aviation Authority of Thailand, checked 27 Sep 2026
- Drone registration sign-up for foreigners — NBTC, checked 27 Sep 2026
- Smile Taxi Service published terms (free 500 MB eSIM with an airport pickup on request; app login by email code), checked 27 Sep 2026