eSIM for Taiwan and Japan: One Plan or Two?
One regional eSIM can cover both countries if its plan lists Taiwan and Japan; otherwise use two country eSIMs. Here is how to choose and which local carriers offer eSIM.
Yes, one eSIM can cover both if you buy a regional plan whose country list names Taiwan and Japan. Otherwise, install two country eSIMs and switch between them. Your phone must support eSIM and not be carrier-locked. Chunghwa Telecom, FarEasTone and Taiwan Mobile in Taiwan, and povo in Japan, offer prepaid eSIM plans for travellers.
Can one eSIM cover both Taiwan and Japan?
Yes, if it is a regional plan that lists both countries. Apple notes that worldwide service providers sell plans with "different data amounts, duration, and countries or regions", so check that Taiwan and Japan are both on the plan's list before you buy. Compare current plans and prices on each provider's own page. Last checked 22 October 2026.
One regional eSIM or two country eSIMs?
- One regional plan: a single install and one bill for the whole trip.
- Two country plans: you can pick a local carrier in each country.
On supported iPhone models, two eSIMs can be active at the same time, for example your home number plus a travel eSIM. Other phones vary, so check your phone maker's own page.
Which carriers in Taiwan and Japan support eSIM?
Apple's carrier list (published 15 September 2026) names:
- Taiwan: Chunghwa Telecom, FarEasTone and Taiwan Mobile, all three with prepaid eSIM plans for international travellers.
- Japan: au, NTT DOCOMO, Rakuten, SoftBank, UQ and Y!mobile for eSIM, and povo for traveller prepaid eSIM.
Does my phone support eSIM?
Check your phone maker's own list rather than a general one, because eSIM support varies by model and region. On an iPhone, also check that it is unlocked: "No SIM Restrictions" next to Carrier Lock means you can use another carrier's eSIM. For Samsung, see our guide to checking a Galaxy phone for eSIM.
You can also roam with your home carrier instead: an eSIM roams the same way a physical SIM does, so ask about travel passes that include Taiwan and Japan.
What you need before you buy an eSIM
Before purchasing an eSIM for your trip to Taiwan and Japan, make sure you have the following information ready:
Your phone's details
Check if your phone is compatible with eSIM technology. Ensure that your device supports dual SIM or has a built-in eSIM slot.
- Check your phone's model number and specifications online
- Verify if it supports dual SIM or has an eSIM slot
Travel plans and data needs
Plan ahead to determine how much data you'll need during your trip. Consider the duration of your stay, the frequency of your internet usage, and any specific requirements like streaming or downloading.
- Estimate your average daily data consumption
- Note down any specific data-intensive activities you plan to do
Carrier lock status
Find out if your phone is carrier-locked or unlocked. If it's locked, you'll need to check with your provider about unlocking options or purchasing an eSIM from a different carrier.
- Check your phone's SIM tray and see if it has a physical SIM card
- Verify the carrier-lock status with your current provider
How to set up your eSIM step by step
- Check compatibility: Ensure that your device supports eSIM technology and is compatible with the carrier you choose.
- Next, download and install the carrier's app on your device. This will help you activate and manage your eSIM plan.
- Sign in to the app: Log in to the app using your account credentials or create a new one if you don't have an existing account.
Activate your eSIM
- Follow the in-app instructions to activate your eSIM plan.
- You may need to provide additional information, such as your name and contact details.
- Choose your plan: Select the desired data package and any additional features you want (e.g., international calls or texts).
- Verify your account: Review your account details and ensure everything is accurate before proceeding.
- Activate the eSIM on your device: Once activated, you can activate the eSIM on your device by following the in-app instructions.
For more information on choosing the right carrier for your travel needs, check out our guide to eSIM for Europe: how to choose and set up a travel eSIM
Tips to save data and avoid roaming charges
When traveling in Taiwan and Japan with an eSIM, it's essential to be mindful of your data usage to prevent unwanted roaming charges. Here are some practical tips to help you minimize your data consumption:
Be mindful of your app usage
Limit your use of data-hungry apps like video streaming services or online games when abroad. Instead, opt for local Wi-Fi networks or use messaging apps with minimal data requirements.
- Use public Wi-Fi hotspots wisely: ensure they're secure and avoid sensitive transactions.
- Disable automatic updates on your phone to prevent unnecessary data transfers.
- Turn off location services and Bluetooth when not in use to conserve battery life.
By being more mindful of your digital habits, you can significantly reduce your data usage and avoid surprise roaming charges.
Common eSIM problems and quick fixes
Connection issues in Taiwan and Japan
If you're experiencing connection issues while using your eSIM in Taiwan or Japan, try restarting your device. This simple step can often resolve the problem.
Another common issue is poor network coverage. Check your eSIM provider's website for information on their coverage areas and potential outages.
Data usage and roaming charges
To avoid surprise data charges, monitor your data usage regularly. You can do this by checking your phone's settings or using an app to track your data consumption.
If you find yourself running low on data, consider purchasing additional data from your eSIM provider or switching to a different plan.
- Check for any software updates that may be available for your device.
- Make sure your eSIM is properly activated and configured.
- Try resetting your network settings or restarting your device.
Sources
Checked 22 October 2026: Apple, use eSIM while travelling internationally and Apple, carriers and worldwide providers that offer eSIM.
Frequently asked questions
Can I use one eSIM in both Taiwan and Japan?
Yes, if you buy a regional plan whose country list names both Taiwan and Japan. Otherwise, use two country eSIMs and switch between them.
Which local carriers offer eSIM in Taiwan?
Apple's carrier list names Chunghwa Telecom, FarEasTone and Taiwan Mobile, all with prepaid eSIM plans for international travellers.
Which carriers offer eSIM in Japan?
Apple's list names au, NTT DOCOMO, Rakuten, SoftBank, UQ and Y!mobile, plus povo for traveller prepaid eSIM.
Does my phone need to be unlocked for a Taiwan or Japan eSIM?
Yes. To use another carrier's eSIM abroad, your phone cannot be locked to your home carrier. On an iPhone, "No SIM Restrictions" next to Carrier Lock means it is unlocked.
Can I keep my home number while using a travel eSIM?
On supported iPhone models, two eSIMs can be active at once, so you can keep your home number and add a travel eSIM for data. Check your phone maker's page for other models.
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How we write: we explain the technology in plain English and compare providers on published features. We do not invent prices; plans change often, so check current pricing with each provider. Some links may earn us a commission at no cost to you (see our affiliate disclosure).