Your phone stops working in a busy Japan station. Maps won't load. Reservations fail. You can't translate signs or get help.
In Japan, mobile data isn't optional. It's how you move, pay, and fix problems fast. The wrong eSIM can leave you stuck when you need it most.
Many Japan eSIMs look similar. But in real use, network access, data limits, and support make a big difference.
This guide compares Sakura Mobile vs Ubigi for 2026, based on how they actually work in Japan—so your connection doesn't fail when it matters.
- TL;DR: Which eSIM is Better?
- Provider Overview: Japan Specialist vs Global Provider
- Network & Coverage: Why Local Routing Matters
- Plans & Pricing
- Setup & Device Compatibility (Important for 2026)
- Customer Support & Risk Protection
- FAQ: Everything You Need to Know Before Buying
- Which Japan eSIM is Best For You?
TL;DR: Which eSIM is Better?
For most travelers in Japan, Sakura Mobile is the choice because it uses local networks, avoids speed throttling, supports local apps, and provides real English support in Japan.
Ubigi is good only for short trips and light data use.
Sakura Mobile works best for most travelers. Buy now and install after landing.
Provider Overview: Japan Specialist vs Global Provider
The main difference between Sakura Mobile and Ubigi is focus. One is built specifically for Japan. The other is built to work almost everywhere.
Side-by-Side Comparison
| What Matters | Sakura Mobile (Local Specialist) | Ubigi (Global Provider) |
| Network Routing | Local Japan connection Your data stays inside Japan | Roaming connection Data routes through overseas servers (Singapore/Seoul) |
| Speed & Stability | High network priority More stable during rush hour in busy cities | Standard priority Can slow down in crowded areas like Shibuya |
| Data Limits | True unlimited 5G with no speed caps 4G plans reset daily (3 GB/day) | "Unlimited" plans slow to 1 Mbps after ~60 GB per month |
| Device Compatibility | Works reliably with all major phones, including Google Pixel 9 and 10 | Known setup issues with Google Pixel 9 and 10 in 2026 |
| English Support | Real English-speaking staff in Japan (phone, chat, email, in person) | Mostly automated support. Human help by email during EU hours |
| Backup & Safety | Compatibility Insurance and physical office in Tokyo | Self-help only. Refunds limited after activation |
Sakura Mobile (Japan Connectivity Specialist)
Sakura Mobile is a Japan-based provider designed for travelers and foreign residents who need reliable internet inside Japan.
What makes Sakura Mobile different:
- Local company, real office in Tokyo, airport counters:
Sakura Mobile has a physical office in Shinjuku, where customers can get in-person help and device support. - Direct access to Japanese networks:
It connects directly to NTT docomo and au (KDDI), keeping data inside Japan for faster, more stable performance. - Built for foreigners in Japan:
Plans, billing, and support are fully available in English, making it easier for visitors and long-term residents.
Best For:
Travelers, remote workers, families, and anyone who needs their connection to work without failure.
Ubigi (Global eSIM Provider)
Ubigi is a global eSIM service that works in over 200 countries.
What Ubigi does well:
- App-based setup
The eSIM is installed and managed through a dedicated app used across different countries. - Multi-country convenience
One eSIM profile can be reused across many destinations. - Lower-cost entry plans
Good for short trips and light data use
Important limits to know:
- Roaming-based service
Data is routed through overseas servers, not fully localized to Japan. - Japan is not its main focus
Support is digital-only, with no local office or in-person help.
Best For:
Short stays, layovers, and travelers who value convenience over local performance.
Network & Coverage: Why Local Routing Matters
The biggest difference between these eSIMs is where your data goes.
Sakura Mobile (Local Japan Routing)
Sakura Mobile keeps all data inside Japan using Tokyo-based servers. This means:
- Faster response times
- Smoother maps and navigation
- A Japanese IP address, so local apps (like Disney Resort and restaurant bookings) work normally
Ubigi (International Roaming)
Ubigi routes data through overseas servers. This can cause:
- Slower loading
- More lag
- Some Japanese apps failing to work
Performance in Cities and Rural Areas
Busy Cities (Tokyo, Kyoto, Osaka)
- Sakura Mobile has higher network priority, so speeds stay stable during rush hour
- Ubigi users may see full signal but slower speeds in crowded areas
Rural Japan & Islands
Both Ubigi and Sakura Mobile use NTT docomo for wide coverage.
Sakura Mobile also supports au (KDDI), which performs especially well in Okinawa and island regions.
Plans & Pricing
Sakura Mobile and Ubigi use very different models in Japan.
Understanding this difference helps avoid slow speeds, hidden limits, and surprise frustration.
Sakura Mobile: Simple, Day-Based Plans
You choose how many days you need. Prices are fixed in JPY and include tax.
- 5G Unlimited eSIM: Truly unlimited data. No daily limits. No slowdowns.
- 4G Unlimited: 3 GB of high-speed data per day, resets daily.
Example Prices:
- 5 days: 3,850–5,500 JPY (~$25.10-$35.86)
- 15 days: 7,150–8,250 JPY (~$46.61–$53.78)
- 30 days: 9,900–14,850 JPY (~$64.59–$96.81)
*Prices are fixed in Japanese Yen and include tax.
*Converted USD prices are estimates only and based on exchange rates as of January 29, 2026
Ubigi: Data-Based Plans
You buy a set amount of data for a set time.
- Cheap starter plans for short trips
- "Unlimited" plans slow down after ~60 GB
- Speed drops to 1 Mbps after the limit
Example Prices:
- 1 GB / 3 days: $3.50
- 10 GB / 30 days: $17
- "Unlimited" / 30 days: $49-$66
*Ubigi prices are listed in USD
Best for light users who track data closely.
For clear pricing and reliable speed in Japan, Sakura Mobile is the safer choice.
The Truth About "Unlimited" Data
Not all "unlimited" plans are truly unlimited.
Sakura Mobile
- 5G Plan: No daily limits, no speed slowdowns
- Hotspot data is limited, but phone usage is not
- 4G Plan: 3 GB/day at full speed, resets daily
Ubigi
- Speeds slow to 1 Mbps after ~60 GB/month or ~15 GB/week
- Fine for maps and messaging
- Video calls and streaming may struggle
If you need constant high speed, Sakura Mobile is the safer choice.
Setup & Device Compatibility (Important for 2026)
Installation
Ubigi (App-Based Setup)
Ubigi eSIMs install through its app on iPhone and Android. Setup is quick and usually takes one tap. A QR code is also sent by email as a backup. This works well for tech-savvy users but can fail if the app glitches.
Sakura Mobile (QR Code Setup)
Sakura Mobile uses a QR code sent by email after purchase. You can scan it using your phone's settings. This takes a little more effort and usually needs a second screen, but it avoids app-related problems and is more stable overall.
Step-by-step setup guides are available after purchase.
Known Device Issues
- Google Pixel 9 & 10: Ongoing Ubigi data failures reported in Japan
- iPhone 17 Air: Ubigi works, but some users report dropouts
Sakura Mobile's local setup is generally more stable on these models.
Check if your device is compatible here.
Customer Support & Risk Protection
Sakura Mobile
- English support by phone, chat, and email (Japan hours)
- Physical office in Shinjuku and airport counters (Osaka, Fukuoka) for in-person help
- Compatibility Insurance: Free Pocket WiFi if eSIM doesn't work
Ubigi
- AI chatbot and email only
- No phone support
- Refunds often denied after activation
If losing internet is a big risk for you, Sakura Mobile offers far more safety.
FAQ: Everything You Need to Know Before Buying
- Q: How do I know if my phone works with a Japan eSIM?
A: Dial *#06# on your phone. If you see an EID number, your device supports eSIM. Most iPhone XS/XR and newer, Google Pixel 3+, and recent Samsung models work.
FAQ
iPhones made for mainland China, Hong Kong, or Macau usually do not support eSIM.
Not sure if your device supports eSIM? Check here
- Q: Will a Japan eSIM work if my phone is carrier locked?
A: No. Your phone must be carrier-unlocked. If it's locked to AT&T, Verizon, or another carrier, you must unlock it before travel. If unlocking isn't possible, Sakura Mobile Pocket WiFi is the safest backup.
- Is "unlimited" data really unlimited in Japan?
A: Usually, no. Most plans have limits.
- Ubigi: Speed slows to 1 Mbps after ~60 GB/month
- Sakura Mobile 4G: 3 GB/day, resets daily
- Sakura Mobile 5G: Truly unlimited—no daily caps, no throttling
👉Best choice for heavy users
FAQ
- Q: Will my eSIM work in rural Japan?
A: Yes. If it uses NTT docomo or au (KDDI). These networks offer the best coverage in Hokkaido, the Alps, and remote areas. Sakura Mobile uses direct domestic connections to these networks.
- Q: Why can't I use the Disney app or book restaurants?
A: Many global eSIMs use foreign IP addresses, which some Japanese services block. Sakura Mobile provides a native Japanese IP, so apps like Tokyo Disney Resort and reservation sites work normally.
- Q: What if I delete my eSIM by mistake?
A: Deleting an eSIM will break your connection.
- Ubigi: Allows up to 5 reinstalls
- Sakura Mobile 4G: Reinstallable on the same device
- Sakura Mobile 5G: Contact support for help.
👉Sakura Mobile offers human support when things go wrong
Contact Us
FAQ
Which Japan eSIM is Best For You?
Choosing between Sakura Mobile and Ubigi comes down to one question: Do you want the lowest price, or the most reliable connection with real support?
Best Choice by Traveler Type & Trip Length
| Traveler Type | Sakura Mobile | Ubigi |
| Short-Term Tourist (1-5 days) | ⚠️ Reliable if it's your first trip or you want backup support and you're willing to pay a little more | ✅ Cheapest option for light data use |
| Digital Nomad / Remote Worker (15-30+ days) | ✅ Best choice Stable speeds, daily resets, true unlimited 5G | ❌ Not ideal Speed throttles after heavy use |
| Family / Group Travelers | ✅ Strong Reliable coverage, English help, lower risk | ⚠️ Works, but no local support if issues happen |
Short Trips (5 days or less)
- Ubigi: Cheapest for light use
- Sakura Mobile: Better to avoid slowdowns and failed apps
Medium Trips (10-15 days):
- Ubigi: Fine for city-only travel
- Sakura Mobile: Better for rural areas and stability
Long Trips (30+ days / Remote Work):
- Sakura Mobile: Faster, more stable, and better value long-term
Final Verdict
If you want a local-quality connection, full access to Japanese apps, and real English support in Japan, Sakura Mobile is the safest and most reliable Japan eSIM in 2026.
Ubigi is best for travelers who want the lowest price and are comfortable handling problems on their own.
