Need mobile data in Japan but not sure whether to choose a physical SIM or an eSIM?
There is no single best option.
The right choice depends on your phone and how you want to use it.
Quick Answer
| Your situation | Consider |
|---|---|
| You want to keep your home SIM in your phone | eSIM |
| You do not want to swap a SIM card | eSIM |
| Your phone does not support eSIM | Physical SIM |
| Your phone has no physical SIM slot | eSIM |
| You prefer using a physical card | Physical SIM |
| You want two lines on one phone | Check Dual SIM support |
Before buying anything, check what your phone supports.
What Is the Difference?
A physical SIM is a small card inserted into your phone.
An eSIM is a digital SIM that can be added to a compatible phone without inserting a card.
Both can provide mobile data in Japan.
The main difference is how they are installed and managed.
Before You Buy, Check These 3 Things
1. Does Your Phone Support eSIM?
Not every phone supports eSIM.
On a Google Pixel, compatible models may show:
Settings → Network & internet → SIMs → Add SIM → Set up an eSIM
On iPhone, check your exact model on Apple’s official website.
Support can vary by model, region, and carrier.
2. Is Your Phone Unlocked?
If your phone is locked to your home carrier, you may not be able to use another company’s SIM or eSIM in Japan.
On iPhone:
Settings → General → About → Carrier Lock
If you see No SIM restrictions, the phone is unlocked.
For Android phones, check with your carrier or phone manufacturer.
3. Does Your Phone Have a Physical SIM Slot?
Look for a SIM tray on your phone or check the specifications for your exact model.
Do not rely only on the phone name.
Some versions of the same phone can have different SIM configurations depending on where they were sold.
Not Sure? Search Like This
Use:
phone model + what you want to check
For example:
iPhone 16 eSIM support
iPhone 16 carrier lock
Pixel 9 eSIM support
Galaxy S25 eSIM support
Galaxy S25 physical SIM
After searching, confirm the information on the official website of your phone manufacturer, carrier, or SIM/eSIM provider.
Want to Keep Your Home SIM?
A compatible Dual SIM phone may allow you to keep your home SIM active while using a Japan eSIM for mobile data.
For example:
Home SIM → calls or messages
Japan eSIM → mobile data
However, Dual SIM features vary by phone and carrier.
Also check your home carrier’s roaming settings, as international roaming charges may apply.
So, Which One Should You Choose?
Consider an eSIM if your phone supports it and you want to keep your physical SIM installed or avoid swapping cards.
Consider a physical SIM if your phone does not support eSIM or you simply prefer using a physical card.
The most important step is checking your phone before you buy.
Official Information
Apple — Using eSIM While Traveling Internationally
Disclaimer
This article provides general information for travelers choosing a SIM or eSIM for use in Japan.
SIM and eSIM compatibility, Dual SIM features, SIM-lock status, physical SIM availability, roaming, and activation methods vary by phone model, region, carrier, provider, and plan.
A phone that supports eSIM does not necessarily support every eSIM provider.
Before purchasing, check the latest official information from your phone manufacturer, home carrier, and the SIM or eSIM provider you plan to use.
International roaming charges may apply if your home SIM uses mobile data while you are in Japan.
