Guide to eSIM in Japan

So, you’ve landed in Japan—home to bullet trains, sushi dreams, and tech innovations that can make your head spin. But how will you get around, find the best spots, and stay connected to share your travel posts with friends? There are plenty of ways to keep your Instagram feed alive and your Google Maps on track, but one of the most convenient is using an eSIM.

What Is an eSIM?

An eSIM (embedded SIM) is a digital SIM technology that eliminates the need for a physical SIM card. Built directly into your smartphone or other compatible devices, eSIMs allow you to activate a mobile data plan instantly by scanning a QR code or downloading a profile.

Unlike traditional SIM cards, eSIMs don’t require you to swap out your current card or fiddle with small trays. You can also store multiple eSIM profiles on a single device, making them an excellent choice for frequent travelers or those looking to maintain both local and international connectivity.

How to decide if an eSIM is for you?

The rise of eSIMs

The popularity of eSIMs in Japan has surged, offering travelers a more seamless way to stay connected, especially in regions where WiFi coverage remains unreliable. Several factors contribute to the growing adoption of eSIMs:

• Many rural areas in Japan still experience patchy coverage, so it may be difficult for travelers to connect to private and public WiFis.

• While public WiFi may be available in certain hotspots, it often lacks the reliability needed for smooth navigation in Japan's famously complex cities.

• Bringing extra gadgets to charge or carry around while exploring Japan may be a bit of a hassle for some.

Benefits of eSIM

eSIMs are revolutionizing the way travelers stay connected, offering a seamless, convenient, and eco-friendly solution for staying connected in Japan. Here are some key benefits of using eSIMs:

• Convenience: Say goodbye to fumbling with physical SIM cards. With eSIM, you can effortlessly switch between carriers and plans, store multiple carrier profiles on a single device, and maintain connectivity across borders—perfect for travelers managing international phone numbers.

• Easy Setup and Installation: Available at airports, mobile carrier stores, and even online, eSIMs can be activated instantly by scanning a QR code or using a carrier’s mobile app—no waiting, no lines.

• Environmentally Friendly: By eliminating the need for plastic SIM cards and bulky packaging, eSIMs contribute to reducing global environmental waste.

• Cost Savings: With eSIMs, you can easily purchase local data plans, often cheaper than international roaming. Many providers also offer competitive, tourist-specific plans that save you money.

• Reliable Connectivity: Japan has extensive eSIM support from major carriers, ensuring reliable coverage for navigation, communication, and streaming.

How to Buy and Set up an eSIM in Japan?

Purchasing and using an eSIM in Japan is a seamless and efficient way to stay connected during your trip. With no need for physical SIM cards or extra devices, the process is straightforward and stress-free.

eSIMs can be purchased in advance through the official websites of local providers or directly upon arrival at the airport. Alternatively, you can buy an eSIM online and activate it before you travel to Japan. Many providers offer QR codes for easy activation via email or apps, so you can get started in just a few steps.

Once purchased, activating your eSIM is simple. Scan the provided QR code or follow the instructions in the carrier app. This means you can connect to Japan's mobile networks almost immediately upon arrival—no need to visit the provider's kiosks or service counters, and no shipping delays.

Comparison of Key Features for eSIMs in Japan

When choosing an eSIM for your trip, consider these factors:

• Carrier and Coverage: Different eSIM providers use various mobile carriers, so it's wise to check coverage in advance, including rural and remote areas. Confirm coverage on a provider’s website map to help understand signal strength, especially if you plan to visit rural regions.

• Network Type and Data Capacity: Most eSIM plans support 4G/LTE networks, with some offering 5G where available. Review the data caps or fair usage policies, as exceeding these limits might result in slower speeds. Choose a plan that matches your expected data usage to avoid interruptions.

• Compatibility and Device Limits: Ensure that your device is eSIM-compatible before purchasing. Most newer smartphones and tablets support eSIM, but older devices may be limited to physical SIMs instead. eSIMs also allow multiple devices, such as smartphones, tablets, or laptops, to share the same data plan, depending on the provider's limits. Check how many devices can connect simultaneously, especially if you’re traveling with family or friends.

• Validity Period: Review the duration of the eSIM plan. Some are valid for just a few days while others extend to weeks or even months. Choose a plan that matches the length of your stay.

• Plan Customization: Many eSIM providers offer flexible plans tailored to tourists, including unlimited data, specific app data allowances (e.g. navigation or messaging apps), or region-specific plans. Some eSIMs provide a Japanese phone number for calls and SMS, which can be useful for reservations or contacting local businesses.

• Customer Support: Ensure the eSIM provider offers reliable customer service, whether through a help desk, chat support, or troubleshooting guides. This is especially useful if you encounter issues during your trip.

Which companies provide eSIM?

eSIMs are a great travel companion, but which providers should you consider? Here’s a roundup of the best providers offering reliable and cost-effective options for tourists.

	Ubigi Features pay-as-you-go eSIM plans for short-term travelers and offers a reusable eSIM in 200+ countries. Mobile data can be topped up anywhere using the Ubigi app.
	Saily Offers affordable data plans of up to 20 GB and supports a single eSIM for multiple travel destinations without incurring roaming charges. New destinations can be easily added to an existing Saily eSIM through the Saily app.
	Holafly Features flexible, unlimited, and customizable data plans for up to 90 days, supporting multi-destination options with automatic data activation in covered locations.
	Airalo Offers a free welcome eSIM with 500 MB of data for first-time users and a one-time purchase of affordable mobile internet valid for a minimum of 7 days.
	Nomad Offers a free trial eSIM with 500 MB of data for first-time users and discounts for group travelers purchasing multiple plans.
	Flexiroam Provides fixed and unlimited plans, as well as a sharable fixed data plan using FlexiShare.
	GigSky Offers free 100 MB of data for new users with no credit card required, along with fixed and unlimited data plans. For frequent travelers, GigSky offers a World Plan with 5 GB of data that can be used across multiple countries.
	Sakura Mobile Provides tourist-oriented eSIM plans with unlimited, high-speed data options and English support for short-term and long-term tourists.
	Mobal Offers data and voice + data plans, covering over 99% of Japan’s area.

What are the alternatives to eSIM in Japan?

While eSIM technology offers a modern and convenient way to stay connected in Japan, it’s not the only option. Travelers can explore several reliable alternatives, each with its advantages.

Data SIMs

For those who prefer not to use eSIM, physical data SIM cards are a reliable alternative. These SIM cards are available at airports, ferry ports, and convenience stores in a variety of packages based on your length of stay and data requirements.

Rental Phone

For travelers who need to make frequent in-country phone calls, renting a phone is possible. Many rental packages offer simple call-only plans for basic communication or comprehensive options that include mobile data for internet access. These rental services are readily available at most major airports; some provide delivery services.

Free WiFi

Japan has significantly improved its public WiFi infrastructure over the past decade. Visitors can find free WiFi at convenience stores, cafes, train stations, and major tourist attractions. While it’s convenient and free of cost, speeds and flexibility may be limited compared to dedicated services. This option works best for light internet users or those who don’t mind occasional disconnections.

Pocket WiFi

For travelers in need of shared internet access across multiple devices, Pocket WiFi remains a popular option. These portable devices allow simultaneous connections for groups and provide high-speed data across Japan. They are available for rent online, at airports, or through delivery to hotels.

Prepaid WiFi Hotspots

Local carriers like SoftBank, Line, and NTT Docomo offer prepaid WiFi hotspot plans that provide access to their expansive network of hotspots. These plans cater to individuals who only need occasional connectivity while traveling and want the flexibility to connect various devices without committing to a SIM or eSIM.