Best eSIM and Pocket WiFi for Japan: How to Stay Online
eSIM, pocket WiFi or a SIM card? How to choose the best way to get mobile data in Japan, what it costs, how much data you need and what to check before you fly.
Quick answer
- Best for most people: a travel eSIM, set up before you fly and working as soon as you land.
- Best for groups: a pocket WiFi router shared between several phones.
- Need a Japanese number?: choose a provider that includes a voice line, such as Mobal.
- Typical cost: around 16 to 18 US dollars for 10GB over 30 days, or about 25 dollars for a week of unlimited data.
- Before you buy: check that your phone is unlocked and supports eSIM.
Mobile data is close to essential in Japan. You will use it for maps, train times, translation and mobile IC cards. Luckily it is cheap and easy to get, and coverage is excellent across cities, trains and most of the countryside.
eSIM, pocket WiFi or SIM card?
| Option | Best for | Watch out for |
|---|---|---|
| Travel eSIM | Solo travellers and couples with newer phones | Phone must be unlocked and eSIM compatible |
| Pocket WiFi | Families and groups sharing one connection | Battery life, carrying it everywhere and returning it |
| Physical SIM | Older phones without eSIM | Swapping cards and finding a shop that sells them |
| Roaming | Very short trips if your plan includes Japan | Can be expensive, so check your plan first |
Choosing an eSIM
Travel eSIMs are bought online and installed with a QR code. Most use one of Japan's big networks: Docomo, au (KDDI) or SoftBank. All three cover the country well.
| Provider | Sample plans | Notes |
|---|---|---|
| Airalo | 10GB for 30 days about 18 US dollars | Popular and easy app, unlimited plans too |
| Ubigi | 10GB for 30 days about 16.50 US dollars | Needs an unlocked phone |
| Holafly | Unlimited, about 27.50 US dollars for 7 days | Hotspot sharing is limited |
| Saily | 10GB for 30 days about 18 US dollars | Fixed and unlimited plans |
| Mobal | Voice line plus data packs | Includes a Japanese phone number, uses Docomo |
Prices change often, so compare before you buy. Most unlimited plans slow down after a daily allowance of a few gigabytes.
Our tip: Install the eSIM at home over WiFi, but switch it on only when you land in Japan. That way the validity period does not start early.
Renting a pocket WiFi
A pocket WiFi is a small router that connects several phones, tablets and laptops at once. You can book online and collect it at the airport, or have it delivered to your first hotel.
- Great value when shared by a family or group.
- Bring a power bank, as the router may not last a long day out.
- Everyone has to stay near the person carrying it.
- Return it at the airport counter or by post in the envelope provided.
How much data do you need?
- Light use: maps, messaging and checking train times: about 5GB a week.
- Average use: plus social media and some photos: about 1GB a day.
- Heavy use: video calls, streaming or working online: 2GB a day or an unlimited plan.
Free WiFi in Japan
Free WiFi is common at airports, major stations, convenience stores, cafes and most hotels. It is fine as a backup, but logging in can be slow and it will not help you on the move.
Avoid entering passwords or banking details on public networks unless you use a VPN.
Checklist before you fly
- Check your phone is unlocked by your home carrier.
- Check your phone supports eSIM. Most iPhones from the iPhone XS onwards and many recent Android phones do.
- Buy and install your eSIM, or book your pocket WiFi for airport pickup.
- Turn off data roaming on your home SIM to avoid surprise charges.
- Download offline maps and a translation app as a backup.
Frequently asked questions
What is the best eSIM for Japan?
For most visitors, a well known travel eSIM such as Airalo, Ubigi or Saily is the easiest choice. If you need a Japanese phone number, consider Mobal.
Is pocket WiFi better than an eSIM in Japan?
Pocket WiFi is better value for groups sharing one connection. An eSIM is simpler for one or two people with compatible phones.
Do I need a Japanese phone number?
Usually not. Messaging apps and data calls cover most needs. A local number helps if you need to book restaurants by phone.
Does mobile data work on the shinkansen?
Yes. Coverage on shinkansen lines is generally good, though it can drop in long tunnels.
We check this guide regularly. Prices, rules and services in Japan can change, so confirm with the official sources below before you travel. Spotted something out of date? Tell us.
