What is an eSIM?
An eSIM is a digital SIM card built into your phone that lets you activate a mobile plan without using any physical card. You can install it before your flight by scanning a QR code or using a provider app, and your connection starts the moment you land.
Unlike a traditional SIM, there’s nothing to swap or lose. Your data plan is stored directly on your device. Most recent phones support eSIMs, including any iPhone from XR and newer, Google Pixel 4+, and many Samsung and Xiaomi models.
In Japan, eSIMs connect to the country’s top networks and deliver high-speed data across major regions, from airports to remote mountain towns. This makes them a simple and reliable way to stay connected throughout your trip, without needing to visit a local store or deal with language barriers.
What’s better for Japan: an eSIM or a local SIM card?
An eSIM is usually better for Japan because it’s faster to set up and works the moment you arrive. You can install it before your flight and avoid searching for SIM card shops or filling out local registration forms.
A local SIM card can be cheaper for long-term residents, but it often requires ID checks and Japanese-language registration. For short or medium trips, eSIMs are simpler, faster, and just as reliable.
Top providers like Ubigi and Holafly connect to Japan’s major networks, giving you high-speed data without the hassle of switching cards or visiting a store.
Best eSIMs for Japan in 2025: Ubigi vs Holafly
The best eSIM for Japan depends on how you travel and how much data you need. Below is a comparison of two trusted providers, Ubigi and Holafly, both offering strong nationwide coverage, flexible plans, and quick online activation.
Ubigi: Best for reliable speed and easy setup
Ubigi is a great option if you value consistent performance and clear pricing. It connects to Japan’s top networks and offers high-speed 4G and 5G coverage across major regions, including remote islands and smaller towns.
Why Ubigi is good for Japan:
- Fast activation via app or QR code
- Plans only start once you land in Japan
- Reliable data connection for work and travel
- Real-time usage tracking in the Ubigi app
- Supports tethering for laptops or tablets
- Discount code NOMADWISE for 10% off your first purchase
Plans start from $17 for 10GB (30 days), and you can easily top up or switch plans anytime.
Holafly: Best for day-based plans and unlimited data
Holafly works well for travelers who prefer unlimited data and flexible durations. Instead of fixed packages, you choose exactly how many days you need, from short getaways to longer stays.
Why Holafly is good for Japan:
- Unlimited data for smooth navigation and streaming
- Plans by number of days instead of fixed bundles
- Instant QR-code activation before departure
- 24/7 English-speaking support
- Works with dual SIM (keep your home number active)
Pricing starts around $2.50 per day for unlimited data (based on 30-day plans).
Both providers are safe options for Japan, easy to use, and designed for international travelers. The best eSIM for Japan mainly depends on whether you prefer fast setup and app control with Ubigi or unlimited day-based flexibility with Holafly.
If you’d like to compare more options, visit our Japan eSIM directory for a full list of providers.
How to choose the right eSIM for Japan
Choosing the right eSIM for Japan depends on how you travel and how you use your data. Start by checking if your phone supports eSIMs, then compare plans based on data limits, duration, and customer support.
Here’s what to consider before buying your Japan eSIM:
- Phone compatibility: Most iPhones from XR and newer, Google Pixel 4+, and many Samsung and Xiaomi models support eSIMs.
- Data usage: Light users can stay connected with 3–5GB per week, while remote workers or streamers may need 10GB or more.
- Trip length: Ubigi is great for longer stays with flexible top-ups, while Holafly lets you choose plans by the exact number of days.
- Support options: Pick providers with reliable customer service or live chat if you need help activating your plan.
- Hotspot needs: Choose a provider that allows tethering if you plan to share your connection with a laptop or second device.
How to set up your eSIM in Japan
Setting up an eSIM in Japan is quick and can be done entirely online. You can install it before your flight and activate the plan as soon as you arrive.
Step by step eSIM setup guide:
- Check compatibility: Make sure your phone supports eSIMs and is unlocked. Most recent iPhones, Google Pixel, and Samsung models are compatible.
- Choose a provider: Pick a trusted option that fits your data needs.
- Buy your plan: Select your data package or duration online and complete the purchase.
- Install your eSIM: You’ll receive a QR code or app link. Scan it or follow the in-app setup instructions.
- Activate your plan: Turn on mobile data and select the new eSIM as your active plan once you land in Japan.
- Test your connection: Open a browser or map app to confirm you’re online before leaving Wi-Fi.
Most travelers complete the process in under five minutes. If anything goes wrong, both Ubigi and Holafly offer quick live chat support to help you get connected.
Travel insurance tip for Japan
Reliable connectivity is only part of traveling smart in Japan. Having good travel insurance matters just as much. If you’re planning a longer stay, coworking trip, or digital nomad visa application, make sure you have international coverage that meets local requirements. You can read our full guide here:
👉 Best Digital Nomad Insurance in Japan (2025)
It explains what kind of health coverage you need, how Genki and SafetyWing compare, and what’s required for long-term stays.
Final recommendation: Best eSIM for Japan in 2025
Both Ubigi and Holafly are excellent choices for staying connected across Japan. The best option depends on your travel style and data needs.
👉 Choose Ubigi if you want fast setup, clear data tracking, and flexible top-ups for longer stays. It’s ideal for digital nomads and remote workers who need stable performance for calls, meetings, or uploads.
👉 Go for Holafly if you prefer unlimited data and simple day-based pricing. It’s perfect for travelers who want to set up once, stay online the whole trip, and not worry about running out of data.
If you’re still unsure, both options work reliably across Japan’s major networks, so you can’t go wrong with either.
