Japan eSIM: from the arrival hall to the Suica gate
A calm plan for your first hour in Japan: install the eSIM at home, switch it on after landing, and put Suica on your phone before you reach the train.
Flights from Seoul, Busan, Taipei and Hong Kong reach Japan in two to four hours, which makes it easy to arrive on a Friday night with nothing planned. The first hour is where a phone matters most: finding the right train out of Narita, Haneda or Kansai, telling a friend you have landed, paying at the gate. This guide is about making that hour boring in the best way.
Install before you fly, switch on after you land
An eSIM is a SIM with no plastic. You install it by scanning a QR code or tapping an install link, and it sits on your phone next to your usual SIM.
The quiet trick is to do the installing at home, on your own Wi-Fi, the evening before you leave. Installing needs a connection, and the airport is the worst place to look for one. Once it is installed, leave the eSIM line switched off until you land.
After the plane lands:
- Open your phone settings and switch the eSIM line on.
- Choose it as the line for mobile data.
- Turn on data roaming for the eSIM line. A travel eSIM is always roaming from the phone's point of view, so without this it stays silent.
- Keep data roaming off on your home line, so it does not use data at home prices.
The plan page tells you when the validity of your plan starts, so you know whether installing early costs you any days.
Suica on your phone
Japan's trains run on IC cards: Suica in the Tokyo area, ICOCA in the Kansai area, and others that work on each other's systems in most big cities. You can buy a plastic card at a ticket machine, but on an iPhone 8 or later you can also add Suica to Apple Wallet and top it up with Apple Pay.
Two things are worth knowing. Adding the card and topping it up need a data connection, so do it after the eSIM is on and before you walk to the gates. Tapping through the gate itself works without any connection at all.
On Android it is different: Suica on the phone needs a phone sold for the Japanese market, so most Galaxy and Pixel phones bought abroad cannot add it. For them the plastic card is the simple answer, and there is a version for short stays, Welcome Suica, sold at the major Tokyo airports.
The apps that want data
Most of a day in Japan runs through a few apps. Google Maps handles train and walking routes well in Japan. Taxi apps such as GO save you from waving at cars that are already booked. Translation apps read menus through the camera. LINE is the messenger many Japanese shops and guesthouses use to answer questions.
None of these need a Japanese phone number. They need data, and a little more than you think when you are lost: maps with the camera turned on use more than maps alone.
Questions travelers ask
When should I install the Japan eSIM?
At home, on Wi-Fi, a day or two before you fly, and then switch the line on only after you land in Japan.
Can I use Suica on my phone without a Japanese phone?
On an iPhone 8 or later, yes: add Suica in Apple Wallet once you have data. Most Android phones bought outside Japan cannot, so use a plastic card such as Welcome Suica.
Does the eSIM give me a Japanese phone number?
No. It is a data eSIM, and your home number stays on your usual SIM for calls and texts.
Do I need data to go through the station gate?
No. Tapping Suica at the gate works offline. You only need data to add the card or to top it up.