What you’ll learn in this article
This article summarizes how to choose the best SIM card, eSIM, and pocket Wi-Fi for people traveling to Japan for tourism, business trips, or short stays.
This guide offers easy-to-understand comparisons for beginners who are unsure which option to choose.
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Features of SIMs for Travelers
SIMs for short-term stays in Japan have the following characteristics:
- Fixed usage period and data capacity (e.g., 7 days, 14 days, 30 days, etc.)
- Mostly prepaid, allowing you to use the full amount without additional charges
- Easy to activate and can be used immediately upon arrival in Japan
- Mostly for data communication only (no phone number)
For travelers, a Japanese phone number is not required, so a data-only SIM is sufficient.
Types of SIMs for Travelers
There are mainly three types of SIMs that travelers can choose from.
Prepaid SIM (physical SIM)
- Can be purchased at airports and electronics retailers
- Can be used simply by inserting it into your smartphone
- Easy to activate with few issues
Suitable for people who
→ Are used to replacing SIM cards / Want to feel secure with a physical card
eSIM (digital SIM that can be issued immediately)
- Can be purchased online before arriving in Japan
- Can be used simply by scanning a QR code
- No need to insert or remove a SIM card
Suitable for people who
→ Use the latest iPhone/Android / Want to ensure communication before arrival
Pocket Wi-Fi (router-type Wi-Fi)
- A type that uses a portable router
- Multiple devices can be connected simultaneously
- Good for travel groups and family trips
Suitable for people who
→ Use it with 2 or more people / Also use PCs and tablets
Data Usage Guidelines
The following is a guide to the amount of data you will need while traveling.
- 3GB: Light travel (maps, SNS)
- 5-10GB: For people who post a lot of photos, videos, and stories
- Unlimited: Constantly watching videos / Usage close to a long-term stay
If you’re unsure, 5GB or 10GB is recommended.
Comparison of SIMs and Pocket Wi-Fi for Travelers
| Item | Traveler SIM | Pocket Wi-Fi |
|---|---|---|
| Convenience | ◎ Just insert it into your smartphone | △ Router needs to be charged |
| Multiple Device Use | △ For 1 person | ◎ Best for 2-5 people |
| Cost | Cheaper | Slightly expensive |
| Activation Effort | Very easy | Requires pickup and return |
Traveling alone → SIM / eSIM
Traveling with multiple people → Pocket Wi-Fi
is the basic way to choose.
Where is the best place to buy?
The main places where travelers can buy SIMs are the following three:
Airports (Narita, Haneda, Kansai, etc.)
- Ideal for those who want to use it immediately
- Staff at the counter will help you with the settings
- However, it is slightly more expensive than in the city
Electronics Retailers (Yodobashi, Bic Camera)
- Many types
- Store staff will help you with the settings
- Ideal for purchasing in the city center
Online Purchase (Prepaid SIM/eSIM)
- Can be purchased before departure
- Can be used immediately after arriving in Japan
- eSIM is issued instantly and is fast
Setup/Activation Procedure (Easy Steps)
SIMs for travelers are very easy to activate.
The general procedure is as follows.
1. Insert the SIM card into your smartphone
Or scan the QR code for the eSIM.
2. Configure APN settings
(Automatic settings are common on iPhones)
3. Turn Airplane Mode ON → OFF
Setup is complete when communication is established.
Points to Note (Troubleshooting)
- A SIM-unlocked smartphone is required
- Some Chinese smartphones have different compatible bands
- Speed will be limited when the data capacity is used up
- Basically, no phone number is provided (for data only)
*If you need a phone number, we recommend a SIM for long-term stays
→ Internal link: “SIM for long-term residents”
Recommended Plans by Usage Scenario
Sightseeing trip (about 1 week)
- Data: 3-5GB
- Type: Prepaid SIM or eSIM
Traveling with friends and family (multiple people)
- Pocket Wi-Fi
- Unlimited plan is recommended
Business trip (short term)
- eSIM or Prepaid SIM
- 5GB is sufficient if you mainly use location information and communication tools
Frequently Asked Questions (FAQ)
Q. Can I buy a SIM at a Japanese airport?
A. You can purchase them at major airports. We also recommend purchasing online in advance as it gets crowded.
Q. Can I make calls with a traveler SIM?
A. Basically, you cannot make calls. If necessary, please use a calling app.
Q. Can I use it with a Chinese smartphone?
A. Some models do not support some bands. Please check in advance.