Updated 2026-10-09
eSIM vs Pocket WiFi vs SIM Card in Japan: Which Should You Choose?
There are three common ways to stay online in Japan: an eSIM, a pocket WiFi (portable router), or a physical SIM card. All three work. The right one depends on your phone, how many people are traveling, and whether you need a Japanese phone number.
Quick answer
| eSIM | Pocket WiFi | Physical SIM | |
|---|---|---|---|
| Best for | Solo travelers and couples with newer phones | Groups and families sharing one connection | Phones without eSIM, or long stays |
| Setup | Install before you fly, no pickup | Pick up and return the device | Insert the card on arrival |
| Things to carry | Nothing | A device to charge every day | The tiny SIM tray tool |
| Phone number | Usually data-only | No | Some plans include one |
eSIM
An eSIM is a digital SIM you download by scanning a QR code or through an app. For most short trips it is the simplest choice: you can install it at home, land in Japan, and be online before you leave the airport.
Check first: your phone must support eSIM and be carrier-unlocked. If your phone was bought on a contract, ask your carrier whether it is unlocked before you buy anything.
Watch out for: "unlimited" plans often have a daily high-speed allowance or a fair-use limit. On Kurabe Japan we flag these plans so you can compare like for like.
Pocket WiFi
A pocket WiFi is a small battery-powered router you rent, usually picked up at the airport or delivered to your hotel. Several phones and laptops can connect at once, which can make it cheaper for a group.
Watch out for: the device has to stay with the group. If you split up for the day, only the person carrying it is online. You also need to charge it every night and return it before you leave Japan.
Physical SIM card
A physical SIM goes into your phone's SIM slot. It is the fallback for phones that don't support eSIM. Some long-stay SIMs also include a real Japanese phone number, which can help with restaurant bookings, deliveries and some apartment or job paperwork.
How to choose
- Solo or couple, newer phone, trip under a month: eSIM. Use our calculator to find the cheapest plan for your number of days.
- Family or group who stay together: compare one pocket WiFi against one eSIM per person.
- Phone without eSIM: physical SIM or pocket WiFi.
- Staying for months, or you need a local number: see Do you need a Japanese phone number?