Ubigi Japan eSIM Setup (iPhone + Android): The Exact Steps That Worked for Me
Set up an Ubigi Japan eSIM on iPhone or Android with this step-by-step guide. Includes activation tips, the settings that matter, common mistakes, and quick fixes if it won’t connect.
6/5/20263 min read
Quick answer (do this first)
If you want the fastest version: buy the plan, install the eSIM, set Ubigi as your mobile data line, turn on data roaming for the eSIM, and restart your phone. If it still won’t connect, jump to the troubleshooting section, it’s usually one setting.
The Japan eSIM I use (so you can start fast)
Landing in Japan with no data is a special kind of stress. This is what I use
Before you start (2-minute checklist)
Your phone must be eSIM compatible and unlocked
Update your phone software (optional, but it avoids weird bugs)
Have Wi‑Fi for the initial install (airport Wi‑Fi is fine)
Don’t delete your main SIM, you can keep it for calls/WhatsApp while using Ubigi for data
Related pages (if you want the bigger picture):
Japan eSIM overview: https://stafaislive.com/japan-esim
My full travel resources list: https://stafaislive.com/travel-resources
Best eSIM for travel (general): https://stafaislive.com/best-esim-for-travel
Step-by-step: Ubigi Japan eSIM setup on iPhone
1) Buy your Ubigi plan
Landing in Japan with no data is a special kind of stress. This is what I use:
2) Install the eSIM
Ubigi will give you a way to install (usually QR / app-based install). Follow their install prompt while you’re on Wi‑Fi.
3) Name the eSIM (so you don’t confuse yourself later)
Name it something obvious like “Ubigi Japan”. Future-you will thank you at 2am when you’re trying to book a train.
4) Set Ubigi as your mobile data line
Go to your mobile/cellular settings and set Mobile Data to Ubigi Japan.
5) Turn on Data Roaming for the Ubigi eSIM
This freaks people out because “roaming” sounds expensive. For travel eSIMs, it’s usually required to connect. Turn Data Roaming ON for the Ubigi eSIM.
6) Restart your phone
Yes, it’s boring. Yes, it works more often than it should.
Step-by-step: Ubigi Japan eSIM setup on Android
Android menus vary by brand, but the logic is the same.
1) Buy your Ubigi plan
If you want the exact setup I use in Japan, start here:
2) Add the eSIM
Go to SIMs / Mobile Network / Add eSIM and follow the install steps provided by Ubigi.
3) Set Ubigi as the mobile data SIM
In SIM settings, choose Ubigi for Mobile Data.
4) Turn on Data Roaming for the Ubigi eSIM
Enable Data Roaming for the Ubigi eSIM.
5) Toggle Aeroplane mode (quick reset)
If it doesn’t connect immediately: Aeroplane mode ON → wait 10 seconds → OFF.
The settings that actually matter (aka what usually breaks it)
If Ubigi isn’t working, it’s almost always one of these:
Ubigi isn’t selected as Mobile Data
Data roaming is OFF for the Ubigi eSIM
You’re in a dead zone and need a restart / aeroplane toggle
APN needs to refresh (rare, but it happens)
Troubleshooting: Ubigi Japan eSIM not working (quick fixes)
No signal / no data in Japan
Confirm Ubigi = Mobile Data
Confirm Data Roaming = ON (for the Ubigi eSIM)
Restart your phone
Toggle Aeroplane mode
eSIM installed but it won’t activate
Make sure you installed it while connected to Wi‑Fi
Don’t delete and reinstall immediately, restart first
If you’re using a VPN, turn it off during activation (you can turn it back on later)
WhatsApp/iMessage worries (will I lose my number?)
You can keep your main SIM active for calls/texts and use Ubigi for data. The key is: don’t remove your main SIM unless you have a specific reason to.
Can I hotspot with Ubigi?
Usually yes, but it can depend on plan/device settings. If hotspot won’t work, restart first, then check your hotspot settings and try again.
My honest take (so you don’t get sold a fantasy)
Ubigi isn’t magic, it’s still mobile data, and mobile data can be patchy in remote areas. But for Japan travel, it’s one of the simplest setups I’ve used, and it saves you from the “landed with no internet” chaos.
If you want the full Japan eSIM breakdown (plans + why I use it):
https://stafaislive.com/japan-esim
And if you want my full list of travel tools I actually use (flights, VPN, connectivity, etc.):
https://stafaislive.com/travel-resources
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