If you’re planning to use an eSIM in Japan in 2025, here’s a calm, practical guide to help you stay connected easily and stress-free.
Whether you’re traveling for a week or staying longer, an eSIM can save you time, money, and hassle.
✅ eSIM Basics: What You Need
- An eSIM-Compatible & Unlocked Phone
Most modern smartphones like iPhones (XS or newer), Google Pixels (3 or newer), and Samsung Galaxy S20 or newer support eSIMs.
Also, make sure your phone is unlocked — that means it’s not tied to your carrier back home. - Internet Access to Install
You’ll need a Wi-Fi connection or mobile data to install the eSIM, so it’s smart to do it before arriving in Japan. - Buy It in Advance
Purchasing and installing your eSIM before your trip lets you connect the moment your plane touches down.
📱 Best eSIM Providers for Japan
Here are some reliable providers that travelers love:
| Provider | Plans & Prices | Highlights | Network |
|---|---|---|---|
| CDJapan Rental | 30GB (8 days) ~¥3,200, 135GB (90 days) ~¥10,800 | Instant QR code delivery, long-term plans | NTT Docomo |
| Mobal | From 1GB to 30GB, includes a Japanese number | Keep your number for calls/SMS, easy to use | NTT Docomo |
| Saily | 1GB (7 days) ~$4, up to 20GB (30 days) ~$25 | Simple app setup, low cost | Major networks |
| Airalo | 1GB (7 days) ~$4.50, 20GB (30 days) ~$26 | Great app, works in multiple countries | NTT Docomo |
| aloSIM | From 1GB ~$4.50, includes calls via app | Supports SMS/calls with add-ons | Major networks |
| Flexiroam | Mix of fixed and unlimited data plans | Great for sharing data across devices | Major networks |
| GigSky | Free 100MB, 10GB (30 days) plans | Fast setup, works across Japan | NTT Docomo |
| Japan Wireless | Unlimited for 15 days (~¥500/day) | English support, flexible options | NTT Docomo |
Prices are rounded and may vary slightly.
⚙️ How to Set Up Your eSIM
- Choose & Purchase Your Plan
Pick a provider and plan based on how long you’ll stay and how much data you’ll need. - Get Your QR Code
You’ll receive a QR code by email or through an app — this is how you install your eSIM. - Install the eSIM Profile
Go to your phone’s settings:
Settings > Cellular (or Mobile Data) > Add Data Plan > Scan QR Code - Activate & Adjust Settings
Set the eSIM as your main data plan and enable data roaming if prompted.
🧭 Helpful Tips for Travelers
- Use Dual SIM
You can keep your home SIM active for calls/texts and use the eSIM just for data. Perfect if you need to stay in touch via WhatsApp or iMessage. - Hotspot-Friendly
Most eSIMs allow you to share your data with a laptop or another phone via hotspot. Very handy! - Coverage Matters
NTT Docomo has excellent coverage across Japan — even in more rural areas. KDDI and SoftBank also offer strong service in cities. - Know When It Activates
Some eSIMs activate as soon as you install them; others only start once you land in Japan. Check carefully to avoid wasting days of data.
🧳 What’s Best for Your Trip?
- Short-Term Travelers
Airalo and Saily are budget-friendly and super easy to install. - Need a Local Number?
Go for Mobal if you want to receive calls or texts while in Japan. - Best Value for Long Trips
CDJapan Rental and Japan Wireless offer large data packs and long validity. - Heavy Data Users
Flexiroam has unlimited plans, great for digital nomads or streamers.
With a good eSIM in place, you can explore Japan worry-free — navigating, translating, booking trains, or sharing your sushi photos in real time.
A little setup now means smooth adventures ahead. Safe travels!
