Ubigi: The Best eSIM for Japan Travel

From navigating unfamiliar train stations to translating a menu, finding your hotel, checking opening hours, or sharing your latest travel photos, having reliable mobile data can make exploring Japan feel much more approachable.

That’s where a Ubigi eSIM comes in, offering a convenient way to stay connected without the hassle of finding a local SIM card or worrying about international roaming charges. As a market leader in eSIMs since 2017, they help international travelers stay connected, wherever they go.

With a Ubigi eSIM, travelers can install a mobile data plan before leaving home, then connect when they arrive at their destination. There is no physical SIM card to swap, no need to queue at a store, and no unexpected roaming bill waiting when you return home.

And while Japan is a popular destination for Ubigi users, its benefits extend far beyond Japan. A single Ubigi eSIM can be reused across more than 200 destinations, making it a practical option for travelers who regularly explore different countries.

Benefits of a Ubigi eSIM

So, what makes a Ubigi eSIM worth considering for your next trip?

One eSIM, 200+ destinations

With Ubigi's Smart eSIM, you can use one eSIM across more than 200 destinations instead of purchasing and installing a new physical SIM card every time you travel.

This can be particularly useful if Japan is part of a longer trip through Asia, or if you travel internationally several times a year. Once installed on a compatible device, your Ubigi eSIM can be reused with different destination plans.

Start your plan when you arrive

Smart Start means your plan starts at your destination rather than while you are preparing for your trip. This allows you to install your eSIM before departure, without worrying about using up your travel data before you even arrive.

Top up whenever you need to

If you use more data than expected, Smart Top-up allows you to add more data whenever you need it—even if you’ve run out of your existing data credits or don't have Wi-Fi available.

That flexibility can be especially useful during busy sightseeing days when you're relying heavily on maps, translation apps, social media, or other data-hungry services.

Share your connection

Traveling with friends or family? Smart Share allows you to share your Ubigi connection with your travel companions, providing another way to stay connected while you're on the move.

Choose your IP location

In selected countries, Smart IP allows you to select your IP location without requiring a VPN. This can be useful for travelers who need to access services associated with a particular location while abroad.

Convenient, instant, and easy to use

One of the biggest advantages of an eSIM is that you can set it up before you travel. Instead of trying to sort it out once you arrive in Japan, you can install your Ubigi eSIM at home and be ready to connect as soon as you arrive.

Ubigi supports compatible smartphones, tablets, and laptops, and the eSIM can be installed through the Ubigi app or by using a QR code. There’s also 24/7 customer support if you need assistance.

The convenience is particularly noticeable in Japan. After a long flight, the last thing you want to do is navigate a physical store, deal with a language barrier, or work out which local data plan to buy. With an eSIM already installed, you can simply turn on your travel data connection and get on with your trip.

Global coverage and connection quality

Ubigi works with major network partners like KDDI and NTT Docomo in Japan to provide fast and reliable connectivity, with 5G available in 90+ destinations and expanding over time.

For travelers, that means your connection can be used for much more than sending the occasional message. In Japan, having dependable data makes it easier to use Google Maps, check train routes, translate signs and menus, research attractions, make reservations, upload photos, and keep in touch with people back home.

Flexible plans without roaming charges

Another major benefit is the flexibility of prepaid data. Ubigi plans range from 1GB options to unlimited plans, so you can choose a package based on how you expect to use your phone.

There are no traditional roaming charges, and because the service is prepaid, you can avoid the uncertainty of receiving a surprisingly large phone bill after your vacation.

Japan-exclusive eSIM plans

Ubigi currently offers one-time unlimited Japan plans in different durations, including 15-day and 30-day options, making it possible to match your plan to the length of your trip.

With competitive pricing in Japan, these plans can offer strong value for travelers who want the convenience of extensive mobile data without compromising on connectivity.

eSIM vs local SIM vs pocket Wi-Fi

An eSIM isn't the only way to get online in Japan. Travelers can also purchase a local SIM card, rent a pocket Wi-Fi device, or use their existing phone plan's international roaming.

But is that the best option for you? Here's a quick comparison:

For many international travelers, an eSIM strikes a useful balance between convenience, flexibility, and price. You don't need to carry another device, and you can keep your regular SIM in your phone if you need it for calls or messages.

How to set up your Ubigi eSIM?

Setting up an Ubigi eSIM is straightforward, but it's important to complete the initial installation before your trip.

1. Check your device compatibility

First, make sure your smartphone, tablet, or laptop supports eSIM technology and is unlocked.

On a smartphone or tablet, you can check for eSIM compatibility by dialing *#06#. If an EID number appears, your device is eSIM-compatible. You should also check that your device is unlocked so that it can use another carrier's eSIM.

2. Choose your Ubigi plan

Select the destination and data plan that best suits your trip. For Japan, you can choose from different data allowances and durations, including unlimited options.

3. Install the eSIM

After purchasing your plan, you can install the eSIM using the QR code provided by Ubigi. Follow the instructions on your device to add the new mobile data plan.

4. Activate your eSIM

Complete the installation before leaving for Japan, then activate the Ubigi eSIM and enable mobile data when you arrive.

Ubigi's Smart Start feature means the data plan can begin when you reach your destination, so you can prepare everything in advance without starting your travel plan prematurely.

An alternative: Use the Ubigi app

You can also purchase and install your eSIM directly through the Ubigi app:

1. Create a Ubigi account.
2. Select "Buy a Ubigi eSIM."
3. Enter your destination and select your preferred plan.
4. After purchasing, tap "Install your eSIM" and follow the on-screen instructions.
5. When you arrive, activate the Ubigi eSIM profile and enable mobile data in your phone's settings.

Download the Ubigi app on iOS or Android and get ready to travel with ease, connected.

Traveling Japan with the Ubigi eSIM

One of the best things about having mobile data in Japan is how much easier it makes travel, from checking train times and translating information to searching for somewhere to eat.

Here’s how we made the most of our Ubigi eSIM.

Toyama: mountains, seafood, and the Northern Alps

From Toyama City, you can explore a quieter side of Japan known for dramatic mountain scenery, fresh seafood, and traditional culture. Use your Ubigi connection to navigate around the city, research local restaurants, check transportation, or plan an excursion into the spectacular Tateyama Kurobe Alpine Route.

Yamanashi: summer festivals and Mount Fuji

Yamanashi is home to some of Japan's most spectacular views of Mount Fuji, as well as a calendar of lively summer festivals. From traditional celebrations to fireworks and cultural events, having mobile data makes it easier to find festival locations, check schedules, navigate unfamiliar streets, and translate information along the way.

Nagasaki: history, culture, and coastal views

Nagasaki offers a fascinating combination of Japanese history, international influences, and beautiful coastal landscapes. Explore historic neighborhoods, visit museums and landmarks, and take in the views across the harbor. 

With an Ubigi eSIM, you can use navigation apps to move around the city, look up the history behind the places you're visiting, and translate information as you explore.

Miyazaki: mythology and natural beauty

On Kyushu's southeastern coast, Miyazaki is known for its beautiful beaches, lush landscapes, and deep connections to Japanese mythology. From atmospheric shrines and dramatic coastlines to local food and rural scenery, it offers a very different experience from Japan's biggest cities.

Mobile data can be particularly useful here for planning routes between attractions, translating information, checking transportation, and finding places to eat along the way.

Is Ubigi the best eSIM for Japan?

For travelers looking for a convenient way to stay connected in Japan, Ubigi eSIMs might be your best choice. You can install your eSIM before departure, choose a prepaid plan that suits your trip, connect when you arrive, and top up if your data needs change.

Its unlimited Japan plans are particularly appealing for travelers who expect to use their phones heavily, while the ability to reuse the same eSIM in more than 200 destinations makes it useful beyond a single vacation.

Most importantly, an eSIM removes one more potential complication from your journey. Instead of worrying about finding a SIM card, carrying a pocket Wi-Fi device, or returning home to an unexpected roaming bill, you can focus on the experience itself.