Japan Travel eSIM
Fast 4G/5G coverage via KDDI / SoftBank. Instant QR activation, no SIM swap.
Reviewed by ALT eSIM Editorial Team
Travel Connectivity Team · Last updated
Plans starting from
- ✓Daily unlimited data (most plans)
- ✓QR code emailed in ~30 sec
- ✓4G/5G high-speed network
- ✓Instant QR code by email
- ✓No real-name / ID registration
- ✓No app blocking — social, streaming & AI all work
Works smoothly with your favorite apps, streaming & AI
Japan eSIM plans
10 plans — pick the duration that matches your trip.
Validity: 1 days
Plan
Japan 1 Day
Validity: 2 days
Plan
Japan 2 Day
Validity: 3 days
Plan
Japan 3 Day
Validity: 4 days
Plan
Japan 4 Day
Validity: 5 days
Plan
Japan 5 Day
Validity: 6 days
Plan
Japan 6 Day
Validity: 7 days
Plan
Japan 7 Day
Validity: 8 days
Plan
Japan 8 Day
Validity: 9 days
Plan
Japan 9 Day
Validity: 10 days
Plan
Japan 10 Day
All sales final — eSIMs are non-refundable once purchased
Japan eSIM vs other options
Why eSIM beats physical SIM and roaming?
Recommended ALT eSIM | Compared Local physical SIM | Compared Carrier roaming | |
|---|---|---|---|
| Price | ✓From US$2.9/day | US$8-19 (airport) | US$13-25/day |
| Activation time | ✓30 sec (pre-install) | 15-30 min queue | Auto-connect (1-5 min) |
| Keep home number for SMS | ✓Yes (dual SIM) | No (physical swap) | Yes |
| Data | ✓Daily unlimited | Plan dependent (capped) | Plan dependent |
| Pricing clarity | ✓Fixed USD price | Pricier at airport | Per-use, bill shock |
| Physical card needed | No (eSIM) | Yes | Uses home SIM |
* Price comparison based on 2026 market estimates; physical SIM prices vary by destination.
Going to more than one country?
One eSIM plan covering multiple countries — no SIM swap when crossing borders.
Japan Network Coverage
On top local carrier 4G / 5G networks.
Carriers
- KDDI
- SoftBank
Network Tech
Bands: B1 / B3 / B8 / B18 / B19 / B28 / n78 / n79
Typical speed: 30-150 Mbps urban; 15-50 Mbps rural
5G widely available in Tokyo / Osaka / Kyoto / major cities; rural coverage strong on 4G LTE (B18/19/28).
Japan real-world speed test
A partner field-tested this ALT eSIM (SoftBank network — 5-day plan — 1GB high-speed per day, then throttled to 128kbps (data-only)) across 12 locations in Japan in December 2024, using Speedtest.net on an iPhone 15 Pro Max.
| Location | Download (Mbps) | Upload (Mbps) |
|---|---|---|
| Narita Airport (arrival) | 12.05 | 1.95 |
| Ginza | 137.45 | 26.28 |
| Nihonbashi Muromachi 3-chome | 112.62 | 16.28 |
| Tokyo Station (Joetsu Shinkansen platform) | 176.20 | 77.73 |
| GALA Yuzawa Ski Resort | 10.95 | 3.05 |
| GALA Yuzawa Station | 9.07 | 4.20 |
| Ueno Station (Joetsu Shinkansen platform) | 119.21 | 4.12 |
| Hodenji | 50.82 | 3.13 |
| Shimbashi (Kani Jigoku) | 55.02 | 2.47 |
| Takashimaya Nihonbashi | 99.19 | 4.53 |
| Tokyo Station 1-bangai | 46.76 | 6.82 |
| Narita Airport (duty free) | 9.41 | 0.40 |
Verdict: Strong across central Tokyo — Ginza, Tokyo Station and Nihonbashi frequently hit 100–176 Mbps, far more than enough for maps, social, streaming and tethering. Speeds drop to about 9–11 Mbps around the GALA Yuzawa ski area and inside Narita's duty-free hall, but stay usable. The 1GB/day high-speed allowance fits typical travel use; heavy users can top up or pick a larger-data plan.
Field-test data contributed by our partner — full report: ManHungTech
6 reasons to use ALT eSIM in Japan
Operated by a Hong Kong travel team — our own platform passes the savings to you. Scan a QR code and you're online.
30-second delivery
QR code emailed instantly after Stripe payment — no shipping wait.
4G / 5G speeds
Top local carriers: Docomo, SoftBank, T-Mobile, Vodafone, and more.
Keep your number
eSIM runs alongside your physical SIM — keep receiving SMS on home line.
Stripe secured
Visa, Mastercard, Apple Pay, Google Pay.
No ID registration
Data-only eSIM — no real-name or ID registration required. Buy and use instantly.
200+ destinations
Asia, Europe, Americas, Oceania — one platform for all your travel data needs.
Zero plastic
No physical card to manufacture or ship — lower carbon footprint.
How to install and activate the eSIM
Takes 2-3 minutes. Do it on home Wi-Fi before departure.
Choose plan & pay
Visa / Mastercard / Apple Pay / Google Pay
Receive QR code email
Arrives in your inbox within 30 seconds of Stripe confirmation
Install on Wi-Fi
iPhone: Settings → Cellular → Add eSIM; Android: Settings → Connections → SIM Manager
Enable on arrival
Turn on Data Roaming when you land
What travellers say
「Used in Japan for 5 days — Docomo signal full bars on arrival, half the airport SIM price.」
— Chan from HK
「Bangkok solo trip 7 days, 3GB was enough, install was super simple.」
— Lam from TW
「Family Europe trip 15 days — multi-country plan, no need to swap between countries.」
— Wong from HK
Japan eSIM FAQ
Common questions. WhatsApp us if anything's missing.
Which carrier network does the Japan eSIM use?▼
Is the unlimited data subject to a Fair Use Policy (FUP)?▼
Do I need real-name or ID registration?▼
Does my phone support eSIM?▼
How do I install? Do I need Wi-Fi?▼
Is it instant? When does the QR code arrive?▼
Can the eSIM make calls or receive SMS?▼
Can I keep my original phone number?▼
What if I can't connect after install?▼
What's the refund policy?▼
Does unused data carry forward?▼
Ready for Japan?
Pick a plan, receive your QR code in 30 seconds, connect on landing.
View all plans ↑