Japan has some of the world’s fastest internet infrastructure in the world, but you don’t really want to get stuck in network dead zones in JR tunnels or in places like Hakone or Japanese Alps ski resorts without signal.
Add the hassle of hunting down physical SIM cards at convenience stores or electronics shops when you’re jet-lagged and don’t speak Japanese, and connectivity becomes a real headache.
eSIMs solve the physical SIM card problem – you can buy them online before your trip and activate instantly upon arrival. But there are different types: international providers that depend on local network partnerships (which usually means slower speeds and coverage gaps), and Japan-focused providers that offer direct access to premium networks but are harder to get.
In this guide, Best eSIMs for Visiting Japan, we highlight several providers worth considering based on your everyday travel needs. Whether you’re visiting Japan for a few days, a few weeks, or a few months, you’ll find an eSIM plan that is right for you.
1. Journey Japan eSIM
Best for: Worry-free Japan travel
Journey Japan eSIM stands out by focusing exclusively on what works in Japan rather than trying to be everything to everyone. Created by Chris Broad of Abroad in Japan specifically for international visitors, it operates exclusively on NTT Docomo’s network – Japan’s most reliable carrier with the strongest rural coverage.
What sets it apart:
- Docomo network exclusivity – No network lottery or coverage confusion. You get Japan’s premium carrier with consistent performance from Tokyo stations to remote mountain villages.
- Japan-only focus – Three simple 30-day plans (10GB, 20GB, 50GB) designed around actual Japan trip lengths, not arbitrary international packages.
- Local expertise – Built by someone who understands Japan travel pain points, not a generic global platform.
- Travel perks included – Partner discounts across Japan add genuine value beyond just connectivity.
We tested the Journey Japan eSIM across multiple scenarios. We achieved excellent performance in Tokyo, Osaka, and Kyoto, with coverage remaining reliable even in rural areas, such as the Hakone mountain region, the Nara countryside, and Hokkaido’s farms.
Setup: Activation code, typically activates within 5 minutes
Plans: 10GB ($19), 20GB ($29), 50GB ($49); all 30-day periods
For travelers who want reliable connectivity without technical headaches, the Journey Japan eSIM is the most straightforward solution that delivers on its promises at competitive prices.
2. Sakura Mobile
Best for: Local expertise and flexible durations
If you want service from a Japan-based company with deep local knowledge and flexible plan customization, Sakura Mobile offers the most authentic Japanese eSIM experience with both 4G unlimited and 5G options.
What sets it apart:
- Local Japanese company – Deep understanding of Japan travel needs and infrastructure.
- Flexible duration options – Choose any period from 3-90 days for precise trip matching.
- True 5G unlimited plans – No daily caps or speed restrictions on 5G plans.
- English support guarantee – Local staff providing comprehensive English assistance.
The 5G plans delivered genuinely unlimited data without throttling, while 4G plans include fair use policies after 3GB daily. Website-based purchasing proved more reliable than app-only competitors.
Setup: Website purchase, email QR code delivery, calendar-based date selection
Plans: 4G unlimited with 3GB daily high-speed (~¥1,650/day), 5G truly unlimited (variable pricing), custom durations 3-90 days
Network: NTT Docomo exclusive with 99% Japan population coverage
Sakura Mobile combines local expertise with modern eSIM convenience to deliver authentic Japanese service quality that international providers struggle to match.
3. Ubigi
Best for: Advanced multi-network platform with many options
Ubigi offers the most sophisticated eSIM platform with multi-network access and advanced features, but requires technical comfort to navigate effectively. Built by Transatel (owned by NTT Docomo), it provides direct access to Japan’s premium networks with global connectivity options.
What sets it apart:
- Multi-network flexibility – Can access both Docomo and other networks for optimal coverage.
- Advanced app features – Real-time usage tracking, auto-refill, and plan stacking capabilities.
- Global platform compatibility – Works across 200+ countries for multi-destination trips.
- Flexible plan options – From 500MB short trips to unlimited data and monthly recurring plans.
Ubigi offers smooth video calling and fast web browsing, thanks to its connection to the Docomo network. However, the app’s complexity can overwhelm casual users.
Setup: Email QR code delivery within seconds, typically activates immediately upon arrival in Japan
Plans: Fixed data: 500MB-60GB ($3-$260), 1-365 day validity; Monthly: 5GB recurring plans; Unlimited: 7-30 day options with fair use policy
Advanced features: Data sharing, plan stacking, Windows laptop support, SmartStart activation
Ubigi combines enterprise-grade features with consumer accessibility, making it an ideal choice for travelers who want control over their connectivity without compromising reliability.
4. Airalo
Best for: Budget-conscious travelers with light data needs
If you’re traveling to multiple countries and want one eSIM that works everywhere, Airalo is the world’s largest eSIM marketplace with coverage in 200+ countries. Their Japan-specific plans offer competitive pricing and a free trial, though performance can be inconsistent across different locations.
What sets it apart:
- Free 500MB trial – Risk-free testing with 3-day validity reduces purchase anxiety.
- Simple app interface – Straightforward setup process minimizes technical confusion.
- Global marketplace – Coverage in 200+ countries with regional and worldwide plans available.
- Competitive pricing – Japan plans start at $4.50, among the most affordable options.
Airalo connects to SoftBank and KDDI networks, providing good urban coverage but potentially slower speeds in rural areas.
Setup: Instant QR code delivery via app, typically activates immediately upon arrival
Plans: 1GB/7 days ($4.50), 2GB/15 days ($6.50), 3GB/30 days ($8.50), 5GB/30 days ($11.50), 10GB/30 days ($18), 20GB/30 days ($26)
Network: SoftBank and KDDI/au roaming, 4G support (no 5G for Japan plans)
Airalo is best suited for short trips and urban-focused travel where budget is more important than performance. The free trial makes it worthwhile to test, but you may need a backup for areas with limited connectivity or critical connectivity needs.
5. Nomad
Best for: Flexible short-term plans, simple format
If you need connectivity on short notice or want maximum flexibility in your plans, Nomad excels at quick setup and immediate availability.
They have a unique daily plan structure and instant activation feature which make them perfect for travelers who prefer to adapt their data usage as they go.
What sets it apart:
- Instant activation – QR code delivery and setup typically completed within 3 minutes.
- Flexible daily bundles – Choose duration (1-7 days) and daily data allowance (500MB-3GB) separately.
- Multi-network access – Connects to both SoftBank and KDDI networks for optimal coverage.
- Add-on capability – Easy data top-ups without purchasing new eSIMs.
Nomad’s eSIM typically features automatic network switching between SoftBank and KDDI. Their app interface simplifies data monitoring and management, although some plans are priced higher than those of competitors.
Setup: App-based purchase and QR code installation, activates automatically upon arrival in Japan
Plans: Day plans: 500MB ($2.50) to 3GB daily; Regular plans: 1GB/7 days ($6), up to 50GB/45 days ($170; Regional options: China-Japan-Korea multi-country packages available
Network: SoftBank and KDDI dual access, 4G/5G speeds with automatic network selection
Nomad solves the problem of rigid data plan structures by letting you customize duration and daily data allowances. It might be ideal for travelers with unpredictable data usage patterns or those who discover their plans changing mid-trip.
6. Holafly
Best for: Heavy data users wanting unlimited plans
If you stream videos, work remotely, or simply don’t want to worry about data limits, Holafly offers Japan’s most comprehensive unlimited data plans. While premium-priced, it eliminates usage anxiety with true unlimited connectivity.
What sets it apart:
- Genuine unlimited data – No daily caps or throttling after specific amounts (fair use policies may apply).
- Flexible duration – Choose exact number of days (1-90) rather than fixed periods.
- Excellent customer support – 24/7 chat support with thorough, helpful responses.
- Hotspot sharing – Up to 500MB daily hotspot capability included.
During our test, video streaming remained smooth throughout, and customer support responded within minutes when contacted. The premium pricing reflects the unlimited nature and superior service quality.
Setup: Instant email QR code delivery, activates automatically upon arrival
Plans: Unlimited data: 1 day ($5.99), 10 days ($36.90), 25 days ($67.90), 50 days ($95.90), 90 days ($138.90)
Network: KDDI and SoftBank partnerships for optimal coverage
Holafly eliminates the stress of monitoring usage, making it worth the premium for travelers who prioritize peace of mind over budget constraints.
7. Mobal
Best for: Longer-term data, voice, and Japanese number
If you need an eSIM with a real Japanese phone number for emergency calling or local business, Mobal is your option. The setup requires ID verification and physical delivery (no instant email activation), but you get actual 070/080/090 phone numbers with full voice and SMS capability that other providers simply can’t match.
What sets it apart:
- Real Japanese phone number – Enables direct calling to 119 (fire/ambulance) and 110 (police) without VoIP complications.
- Voice and SMS included – For emergency hotel bookings & restaurant reservations.
- Long-term options – Monthly plans support extended stays with no contracts.
Setup takes around 15 minutes once you receive your access code, with consistent speeds and excellent coverage throughout Japan. Customer service quality can be slow during peak travel seasons, though support staff provide thorough assistance when reached.
Setup: Physical delivery or pickup required, ID verification process, typically 2-5 business days for international shipping
Plans: Data-only: 8-day (3GB-30GB), 16-day (3GB-100GB), 31-day (10GB-100GB); Voice+Data monthly: 1GB (¥1,650), 5GB (¥3,190), 10GB (¥3,630), 30GB (¥4,378); Initial eSIM cost: ¥2,970
Mobal solves the critical gap that data-only eSIMs create for emergency situations, making it essential for travelers who want complete peace of mind in Japan.
How to Check if Your Phone is eSIM Compatible
Before purchasing any eSIM, you need to confirm your device supports eSIM technology and is carrier-unlocked.
Here’s how to check both requirements:
Quick eSIM Compatibility Check
- Universal method (works on all devices): Dial *#06# from your phone’s dialer. If you see an EID (embedded identity document) number displayed alongside your IMEI, your device supports eSIM. The EID is typically 32 digits long.
- iPhone users: Go to Settings → General → About → scroll down to find “Digital SIM” or “EID.” If these appear, your iPhone supports eSIM.
- Android users: Go to Settings → About Phone → SIM Status (or Network). Look for “EID” or “eSIM” information. On some devices, check Settings → Network & Internet → Mobile Network for eSIM options.
Carrier Lock Check
- iPhone: Settings → General → About → scroll to “Carrier Lock” or “Network Provider Lock.” You want to see “No SIM restrictions” – anything else means your phone is locked.
- Android: Contact your original carrier or try inserting a SIM from a different carrier. If it works, your phone is unlocked.
Common eSIM-Compatible Devices
- iPhones: iPhone XS and newer (except mainland China, Hong Kong, Macau models)
- Samsung: Galaxy S20 and newer, Galaxy Note 20 and newer
- Google: Pixel 3 and newer
- Other brands: Most flagship models from 2019 onward
If your device doesn’t support eSIM, you’ll need to:
- Rent a physical SIM card at the airport
- Use pocket WiFi rental services
- Consider upgrading to an eSIM-compatible device before traveling
Important: US iPhone 14 and 15 models are eSIM-only and don’t accept physical SIM cards, making eSIM your only option for connectivity in Japan.
Key Considerations When Choosing a Japan eSIM
Cost and Value
Don’t get caught off guard by eSIM pricing – it varies wildly depending on your trip length and how much you’ll actually use your phone. A week-long Tokyo adventure might only set you back ¥1,500-4,000 ($10-27) if you’re just using maps and posting the occasional Instagram story. Planning a proper 2-3 week Japan exploration? You’re looking at ¥3,000-8,000 ($20-55), and if you’re doing the full month-long immersion, budget around ¥6,000-15,000 ($40-100).
Watch out for sneaky extras that aren’t mentioned in the flashy headline prices. Mobal hits you with ¥200 per minute for international calls, and going over your data limit can trigger expensive overage fees. Long-term travelers often discover they can’t just extend their plan – you’ll need to buy a completely new eSIM, which gets pricey fast.
Coverage
Your eSIM’s network partnership determines whether you’ll have signal when you need it most. NTT Docomo (used by Journey Japan, Mobal, and Sakura) dominates rural Japan – we’re talking mountain onsen, countryside ryokans, places where other networks just give up.
SoftBank providers like Airalo work great in Tokyo but can leave you stranded in the countryside, while KDDI networks offer decent middle-ground coverage.
All providers work fine in Tokyo, Osaka, and Kyoto – that’s not where the differences show up. It’s when you’re trying to navigate to some remote temple in Nara or upload photos from Hakone that network choice really matters. If your itinerary includes anything beyond the Golden Route, go with a Docomo-based provider and thank us later.
5G sounds impressive, but not all eSIMs actually give you access even in 5G areas. Journey Japan, Ubigi, and Sakura connect to 5G networks, while Airalo’s Japan plans stick you with 4G despite faster networks being available. Unless you’re staying exclusively in major city centers, 5G coverage drops off quickly anyway.
Data Usage
Most people completely underestimate how much data they’ll burn through in Japan. Sure, you might use 1-2GB per week at home, but that’s when you’re connected to WiFi most of the day. In Japan, you’re constantly using Google Translate on restaurant menus, live-streaming your ramen discoveries, and video-calling friends to show off temple visits.
Those “quick” activities add up faster than you think. Google Translate’s camera feature is a data hog when you’re scanning every sign and menu. Streaming music during those long Tokyo commutes? That’s more data gone. One hour of HD video calling home costs about 1GB, and uploading all those perfect cherry blossom shots throughout the day can easily blow past casual usage estimates.
Don’t fall for the “unlimited” marketing without reading the fine print. Most providers throttle you to painful speeds after 2-3GB daily – fine for messaging, useless for anything else. These limits reset at midnight Japan time, so plan your heaviest usage accordingly.
Emergency and Safety
Here’s something most travel blogs don’t mention: most eSIMs can’t actually call emergency services. They’re data-only, meaning no direct calls to 119 (ambulance) or 110 (police).
Download offline maps before leaving WiFi areas, screenshot all your important reservation emails and addresses, and seriously consider buying eSIMs from two different providers. Yes, it costs more, but being completely cut off in rural Japan isn’t worth the savings.
Your phone battery will drain faster with dual SIM setup (your home SIM plus the eSIM), so pack a portable charger and test everything before you travel. Nothing ruins a day trip like a dead phone and no way to navigate back to your hotel.
Customer Support
The most common issues are eSIM activation failures and weird network problems in specific locations. Live chat usually gets faster results than email, and WhatsApp support (where available) tends to be surprisingly responsive. Phone support is rare but gold when you find it.
Pay attention to installation timing – some eSIMs start billing the moment you install them, while others wait until you’re actually in Japan. Install too early with the wrong provider and you’re paying for days you haven’t even left home yet.
Seasonal Timing
Japan’s peak travel periods turn normally reliable networks into frustrating messes. Golden Week (late April/early May) brings network congestion that affects everyone, cherry blossom season creates tourist area bottlenecks, and summer festivals can completely overwhelm local towers. Premium providers handle these rushes better, but budget options might leave you with dial-up speeds in crowded areas.
Weather throws curveballs too. Typhoons knock out cell towers, heavy snow in mountain areas kills coverage, and Tokyo’s brutal summer heat can cause phones to overheat during eSIM setup. These aren’t everyday concerns, but they’re worth keeping in mind when timing your trip and choosing your provider.
The bottom line: Match your specific needs and budget to the right provider instead of just grabbing the cheapest option. A few extra dollars for better coverage often pays for itself when you’re not stressed about connectivity during your dream Japan trip.
