How to use eSIM in Japan - Recommend eSIM Plans

When planning a trip to Japan, booking accommodations and flights is essential. Similarly, it’s a good idea to consider an eSIM that works in Japan. If your smartphone supports eSIM, it can be very convenient. eSIMs do not require a physical SIM card and use the built-in SIM function of your smartphone.
In this article, we will explain in detail how to choose, set up, and use an eSIM in Japan.

What is an eSIM? Understanding the System

An eSIM (embedded SIM or electronic SIM card) is a small chip embedded directly in devices like smartphones and smartwatches. Instead of inserting a physical SIM card, you can download your subscription information via the internet to the built-in chip in your device. While a regular SIM card is a physical SIM, an eSIM is a digital SIM.
With an eSIM, you can purchase a data plan at an airport with WiFi access and start using it immediately. This makes it a very convenient option for travelers.

Advantages of an eSIM

Here are some of the benefits of using an eSIM

Everything is done online

With a physical SIM card, you must wait for it to be delivered or pick it up at a store before you can use it. This process takes time. In contrast, an eSIM can be purchased online and set up instantly on your device.
You don’t have to wait in long lines at Japanese airports to buy an expensive SIM card.

Can combine multiple networks

eSIM is useful for dual SIM users. Dual SIM allows you to use two SIMs on a single smartphone. If your smartphone supports eSIM, you can use a regular SIM card and an eSIM at the same time, enabling two separate phone lines.

Convenient for international travelers

For international travel, you can rent a pocket WiFi or buy a prepaid SIM at your destination. However, with an eSIM, you can purchase and activate a data plan online before arriving, making it easy to use immediately upon arrival.

If you use an iPhone, you can store more than eight eSIMs. For example, you can save a "Japan eSIM" on your phone and simply switch to it when needed—no need to worry about losing a physical SIM card.

Disadvantages and Precautions of eSIM

While eSIMs are convenient, there are some things to be aware of.

Limited device compatibility

eSIMs only work on devices that support them. If your current smartphone does not support eSIM, you will need to buy a new one.
You can check if your device is compatible here.
How to Quickly Check if Your Smartphone Can Use a Japanese eSIM in 5 Seconds

Cannot be restored if deleted

Once you delete an eSIM from your device, you cannot recover it.
Even if you need to reset your eSIM settings, avoid deleting the eSIM itself.

How to Choose an eSIM Plan: Key Points for Travelers

When selecting an eSIM plan, consider the following factors.

Check your destination

If you plan to visit different places in Japan, choose a network that covers all areas. For cities like Tokyo and Osaka, most networks will work fine. However, if you plan to visit rural areas, choosing an eSIM that uses docomo network is recommended.

Length of stay

Select a plan that matches the duration of your trip.

Data usage

Estimate your usual data usage and choose an appropriate plan.
For most travelers, a plan with 1GB per day should be sufficient.
How much data do you need in Japan

Budget

Choose a plan that fits your budget and avoid overpaying for unnecessary data.

Customer support

Check if customer support is available in case of issues.
However, it is even more important to prevent issues beforehand, so you won’t need to rely on support.

User reviews

Reading other users' reviews and feedback will help you understand the actual performance of the eSIM service.

By considering these points, you can select the best eSIM plan for your needs.

How to Set Up an eSIM: A Simple Step-by-Step Guide

1. Check device compatibility

How to Quickly Check if Your Smartphone Can Use a Japanese eSIM in 5 Seconds

2. Purchase an eSIM

3. Install the eSIM using a QR code

For iPhone

Go to **Settings → Cellular → Add Cellular Plan** and scan the QR code.

For Android

Go to **Settings → Connections → SIM Card Manager → Add Mobile Plan** and scan the QR code.

Activate the eSIM

After installation, select the new eSIM and enable it.

Important Notes for Using eSIM in Japan

Here are some key points to remember for a safe and smooth eSIM experience.

Set up the correct APN

Some eSIM services claim they work without setting up an APN. However, this only applies if your phone does not have any APN settings. Since most smartphones already have an APN configured, make sure to update it correctly for Japan.

Do not delete your eSIM

If your eSIM doesn’t work, many people try reinstalling it by deleting it first. However, once deleted, the eSIM cannot be recovered, and you will need to purchase a new one. In most cases, connection issues are caused by incorrect APN settings.

Recommended eSIM Plans

To find the best eSIM plan for you, compare options based on travel duration, data usage, and budget.