Internet in Japan for tourists

Maps use data when you search for a route, change direction or explore a new neighbourhood. Translation apps may need a connection for text, camera or voice features. Train and metro apps also update as you check routes, transfers and service information.

Add ticket emails, hotel messages, restaurant searches and photo sharing, and the phone can be busy throughout the day. If you rely on it for more than occasional messages, your data needs will be higher than those of a traveller who mostly leaves their phone in their pocket.

Watching video, uploading large photos or files, and working from the phone can increase use quickly. Include that in your choice if it is part of the trip.

On a short city break, maps, translation, train times and messages may be your main needs. Choose based on your own phone habits. Someone who checks every turn uses data differently from someone who opens maps only a few times a day.

For a one or two week trip, you can choose between a fixed data package and a plan with a daily allowance. A fixed package may suit you if your use will vary from day to day. A daily plan may suit you if you prefer a fresh allowance for each day.

With SefereSIM day passes, the day’s allowance is available at full speed first. Once it is used, the connection slows down rather than cutting off. That gives you a clearer idea of what to expect later in a busy day when you still need maps or messages.

For a longer stay, or a trip where you will also use the phone for work, include more than routes and translation in your estimate. A plan chosen only for the first day may not fit the rest of the trip.

Install the eSIM at home while you have Wi-Fi. You can check that your device supports eSIM and that the line has been added without trying to solve it at the airport.

Installation does not start the plan days. The clock begins when the eSIM first connects to a network in Japan. It is safe to add the eSIM before your flight.

On a dual-SIM phone, you can keep your regular line for calls, SMS and banking codes while using the travel eSIM for mobile data. Check your regular line’s data roaming setting separately.

Downloading offline maps, important bookings and the translation languages you use most while at home can reduce the data you need on arrival. You will still want a connection for live routes, transit information and searches while you are out.

For a solo trip, or a trip where people will explore separately, an eSIM keeps data on your own phone. You can keep using it when you leave a station, look for your hotel or change plans during the day.

A group travelling together may prefer a shared device. Think about what happens when the group divides. If each person will find their own route, read messages or take different trains, separate connections are usually more convenient.

If your phone does not support eSIM, check the alternatives before you travel. The useful question is how you expect to use your phone, not just how much data is written on a plan.