How to Use an eSIM for Japan: A Complete Step-by-Step Guide

Traveling to Japan—a land of ancient temples, high-tech cities, sushi, and cherry blossoms—can be an unforgettable experience. But staying connected while you're there is essential, whether it’s for navigating Tokyo’s subway system, translating menus, or sharing moments with family and friends. In this age of digital convenience, using an eSIM for Japan is one of the smartest ways to stay online without the hassle of physical SIM cards or expensive roaming charges.

This comprehensive guide breaks down everything you need to know about using an eSIM for Japan, from what it is, how to set it up, choosing a provider, and tips for a smooth experience.

What is an eSIM and Why Use One for Japan?

An eSIM (embedded SIM) is a digital version of the physical SIM card that we traditionally use in mobile phones. Unlike a physical SIM, you don’t need to insert or swap anything—everything is handled digitally. eSIMs are built into your device and can be activated by downloading a software profile provided by your mobile carrier.

Why is an eSIM useful for Japan?

• Convenience: No need to find a store or vending machine for SIM cards in Japan.

• Instant Activation: You can activate your eSIM before even landing in Japan.

• No Roaming Fees: Local eSIM plans are cheaper than international roaming.

• Dual SIM Functionality: You can use your primary number while accessing local data.

• Eco-friendly: No plastic waste from disposable SIMs.

Step-by-Step Guide to Using an eSIM for Japan

Step 1: Check if Your Phone is Compatible

Before anything else, make sure your phone supports eSIM technology and is unlocked.

eSIM-Compatible Devices (as of 2025)

Most modern phones support eSIM, including:

• iPhones: XS, XR, and newer

• Google Pixel: Pixel 3 and newer

• Samsung: Galaxy S20 and newer, Fold/Flip series

• Other brands: Motorola, Huawei, Oppo, and Sony (selected models)

Also, ensure your phone is carrier unlocked, meaning you can use it with other carriers.

Step 2: Choose a Reliable eSIM Provider for Japan

There are several providers offering eSIM plans for Japan. These plans differ in data allowance, duration, speed, and whether they support tethering or voice calls. Here's what to consider:

Factors to Compare

• Data Allowance: Ranges from 1 GB to unlimited.

• Validity Period: Choose based on trip duration (3, 7, 15, 30 days, etc.).

• Coverage & Speed: Ensure the plan runs on reliable Japanese networks like NTT Docomo, SoftBank, or KDDI.

• Hotspot/Tethering Support: If you plan to share your connection.

• Customer Support: Check if they offer 24/7 multilingual support.

Popular eSIM Providers for Japan

• BazTel

• Ubigi

• Nomad

• Truphone

• B-Mobile (Japanese provider with tourist eSIM options)

Step 3: Purchase and Download the eSIM Plan

Once you’ve selected a provider:

1. Visit the provider’s website or app.

2. Choose the eSIM plan for Japan that fits your needs.

3. Pay using a credit card or digital wallet.

4. You will receive an installation QR code via email or the app.

Step 4: Install the eSIM on Your Device

The process may slightly vary depending on your phone, but the basics are similar.

On iPhone (iOS 15 and above)

1. Open Settings > Cellular > Add Cellular Plan.

2. Scan the QR code sent by the provider.

3. Label the new plan (e.g., “Japan eSIM”).

4. Choose whether to use the eSIM for data only or also for voice/SMS (if supported).

5. Set the eSIM as your primary or secondary data plan.

On Android (Pixel, Samsung, etc.)

1. Go to Settings > Network & Internet > Mobile Network > Add Carrier.

2. Tap “Download a SIM instead?” or “Use a QR code.”

3. Scan the QR code or enter the activation code manually.

4. Confirm the eSIM setup and label it.

Tip: Activate the plan just before or after landing in Japan, especially if the validity period starts immediately after installation.

Step 5: Configure Your Network Settings

After installation, you might need to tweak your phone’s settings:

• Turn off data roaming for your primary SIM to avoid roaming charges.

• Enable mobile data on the Japan eSIM.

• Set the Japan eSIM as default for mobile data.
  If you want to keep receiving calls or messages on your home number, keep your primary SIM active for voice/SMS only.

Pro Tip: If your eSIM provider offers an app, install it for easy management and support.

Step 6: Test the Connection

Once your eSIM is installed and you’re in Japan:

1. Restart your phone.

2. Wait for the signal to appear.

3. Open a browser or use an app to check internet connectivity.

4. Check that data is routed through the eSIM and not your physical SIM.

If it doesn’t work:

• Make sure mobile data is enabled for the eSIM.

• Verify APN settings (your provider may require manual input).

• Contact the provider’s support for help.

Step 7: Enjoy Seamless Connectivity in Japan

Now that your eSIM for Japan is active, you can navigate Japanese cities, translate text, make VoIP calls, and access your favorite apps with ease.

Here are some tips for using your eSIM efficiently:

Data-Saving Tips

• Use offline maps with Google Maps or Maps.me.

• Download language packs for Google Translate.

• Use Wi-Fi in hotels and cafes to reduce mobile data usage.

• Turn off auto-play for videos on social media.

• Disable background app refresh.

Step 8: Monitor Your Usage

Most eSIM providers offer a dashboard or app where you can:

• Check data usage.

• Purchase top-ups if needed.

• Extend the validity of your plan.

If you run out of data mid-trip, many providers allow you to buy more without re-installing anything.

What Happens After Your Trip?

At the end of your visit to Japan: