What is an eSIM?
An eSIM is a digital SIM card built into your phone. Instead of swapping a physical SIM, you scan a QR code and your phone connects to a Japanese carrier automatically.
Modern iPhones (XS and later) and most Android flagships support eSIM. If you're unsure, check your phone settings for “Add eSIM” or “Add Mobile Plan.”
eSIM vs Pocket Wi-Fi: eSIM wins on convenience — no device to carry or charge, no sharing with travel companions (each person gets their own plan), no counter to queue at on arrival.
How to set it up
Buy before you board
Purchase your eSIM online (takes 2 minutes). You'll receive a QR code by email immediately.
Install the eSIM at home
Go to Settings → Cellular → Add Plan on your iPhone or Android. Scan the QR code. Done.
Activate on arrival
Turn off your home SIM data roaming and enable the Japan eSIM. You're online before you clear customs.
Use Google Maps freely
Navigate trains, find restaurants, translate signs with your camera — no Wi-Fi hunting required.
Comparison
Choose Your Plan
Best for most travellers
Airalo
Moshi Moshi 10GB
Data
10GB
Duration
30 days
Speed
4G LTE
Easiest setup — install in under 3 minutes
Huge global provider with 24/7 support
Works the moment you land
App-based top-ups if you run out
Data-only — no calls or SMS
10GB may not be enough for a long trip
Networks
From
$18
Best unlimited
Holafly
Japan Unlimited
Data
Unlimited
Duration
30 days
Speed
4G LTE
Truly unlimited data
Strong NTT Docomo coverage nationwide
Good for heavy users & streamers
More expensive
Speed throttled after ~1GB/day
Data-only
Networks
From
$49
Best budget
GigSky
Japan 3GB
Data
3GB
Duration
15 days
Speed
4G LTE
Budget-friendly for short trips
KDDI (au) is Japan's second-largest network
Simple, no-frills setup
Only 3GB — light browsing only
15-day cap
Less known support
Networks
From
$12
Common Questions
Will my phone work with an eSIM?
Most phones made after 2018 support eSIM. Check Settings → Cellular → Add Cellular Plan. If the option exists, you're good.
Can I make calls with a Japan eSIM?
Most travel eSIMs are data-only. For calls, use WhatsApp, FaceTime, or LINE over data — most of Japan uses LINE for everyday communication.
Do I need to remove my home SIM?
No. eSIM and physical SIM operate independently. Keep your home SIM in — just disable data roaming on it to avoid charges.
What if I run out of data?
Airalo and most providers offer top-up plans directly through their apps. Buy more data in 60 seconds without visiting a store.
Is the coverage good outside cities?
Japan has excellent rural coverage on major carriers. SoftBank and NTT Docomo cover 99%+ of the population. Mountain trails are the exception.
Should I use eSIM or pocket Wi-Fi?
eSIM is simpler for solo travellers. Pocket Wi-Fi is better for groups wanting to share one plan — but there's a device to carry, charge, and return.