Setting up a Japan eSIM on your iPhone takes about three minutes, and the Japan eSIMpass plan starts at £1.75. The single most important rule: install the eSIM before you fly, while you are still on your home Wi-Fi. Installation needs an internet connection, activation on arrival does not. Do it at your kitchen table, label the line, and your iPhone connects to a Japanese network the moment you land at Haneda or Narita and switch Data Roaming on.
This guide walks through every step for iPhone, from buying the plan to choosing which line handles your data in Tokyo. It works on any eSIM-capable iPhone, from the iPhone XR and XS through the latest models. Still comparing plans? Our best eSIM for Japan guide lays out the options, and the general eSIM setup and activation walkthrough covers other devices.
What You Get With a Japan eSIM
An eSIMpass Japan plan is prepaid and data-only. That means:
- No phone number and no Japanese SIM to insert. It is a data connection that rides on a major Japanese network (such as NTT Docomo, SoftBank, or au).
- Instant QR code delivery by email, usually within a minute of paying. There is no activation fee and no waiting for anything to ship.
- Your home number stays live. Because the eSIM is a second line, your regular SIM keeps working for calls and texts. More on that dual SIM setup below.
Any iPhone from the XR/XS generation onward supports eSIM, so a phone bought in the last several years will work. The one requirement is that your iPhone is network-unlocked. If you bought it outright or finished paying it off, it almost certainly is.
Japan eSIM Plans and Pricing
| Data | Duration | Price |
|---|---|---|
| 1GB Data | 7 Days | £1.75 |
| 3GB Data | 15 Days | £4.32 |
| 5GB Data | 30 Days | £5.98 |
| 10GB Data | 30 Days | £9.97 |
| 20GB Data | 30 Days | £16.62 |
| 50GB Data | 30 Days | £25.68 |
| 1 Day | 1 Day | £2.59 |
| 2 Days | 2 Days | £5.19 |
| 3 Days | 3 Days | £7.78 |
| 4 Days | 4 Days | £10.20 |
| 5 Days | 5 Days | £12.93 |
| 6 Days | 6 Days | £15.67 |
| 7 Days | 7 Days | £18.41 |
| 8 Days | 8 Days | £19.78 |
| 9 Days | 9 Days | £21.83 |
| 10 Days | 10 Days | £23.20 |
| 11 Days | 11 Days | £25.25 |
| 12 Days | 12 Days | £27.30 |
| 13 Days | 13 Days | £28.67 |
| 14 Days | 14 Days | £30.04 |
| 15 Days | 15 Days | £32.09 |
| 16 Days | 16 Days | £33.46 |
| 17 Days | 17 Days | £34.15 |
| 18 Days | 18 Days | £35.51 |
| 19 Days | 19 Days | £37.57 |
| 20 Days | 20 Days | £38.94 |
| 21 Days | 21 Days | £40.30 |
| 22 Days | 22 Days | £40.99 |
| 23 Days | 23 Days | £41.67 |
| 24 Days | 24 Days | £42.36 |
| 25 Days | 25 Days | £43.04 |
| 26 Days | 26 Days | £43.73 |
| 27 Days | 27 Days | £44.41 |
| 28 Days | 28 Days | £45.09 |
| 29 Days | 29 Days | £45.78 |
| 30 Days | 30 Days | £47.15 |
Pick the data size that matches your trip. Japan is heavy on maps, train apps, and translation, but light on the huge downloads that eat data at home. If you are unsure, this quick estimator gives you a personalised number:
For most travellers, 3GB to 5GB comfortably covers a one-week trip of daily navigation, messaging, and photo sharing, especially since hotels, convenience stores, and most trains offer free Wi-Fi to top up on.
Step 1: Buy the Plan and Get Your QR Code
Choose your Japan plan on the Japan eSIM page, select the data amount, and check out. Within a minute or two you get an email containing a QR code and a set of manual install details as a backup.
Do this a day or two before you fly, not at the airport. You want to install it calmly on a reliable connection, not while juggling a boarding pass at the gate. When the validity starts depends on the plan: per-GB plans start when the eSIM first connects to a network in Japan, not when you install it, so installing early does not waste any days. Unlimited plans run on the travel dates you select at checkout - the days count from your chosen start date whether the eSIM is installed or not, so install early by all means, just no later than your selected start date. Check the validity note on your plan to be sure.
Step 2: Install the eSIM Before You Fly (on Home Wi-Fi)
This is the step people get wrong, so read it carefully. Install while you are still at home, connected to Wi-Fi. The QR scan downloads the eSIM profile over the internet, and you will not have internet in Japan until this is already done.
On your iPhone:
- Open Settings > Mobile Service (it may read Mobile Service or Mobile Data in some regions).
- Tap Add eSIM, then Use QR Code.
- Point the camera at the QR code from your email. If you are reading the email on the same phone, tap Enter Details Manually and paste the SM-DP+ address and activation code from the email instead.
- Follow the prompts to add the plan. Your iPhone downloads the profile. This takes a few seconds.
When it finishes, the eSIM is installed but idle - it cannot connect to anything until it reaches a network in Japan. On a per-GB plan no days are billed yet either; on an Unlimited plan the clock follows the rule from Step 1. Nothing to worry about yet.
Step 3: Label the Line So You Do Not Get Confused
Right after installing, your iPhone asks you to label the new line and set defaults. Do not skip this. Give the eSIM a clear name like Japan Travel and keep your existing SIM labelled Home or with your network's name.
Clear labels are what make dual SIM painless. When you are standing in Shinjuku station deciding which line should carry your data, "Japan Travel" versus "Home" is obvious. "Secondary" versus "Primary" is not.
While you are here, iPhone will ask which line to use for iMessage, FaceTime, and default voice. Leave calls and messages on your home line so friends and family still reach you on your normal number.
Step 4: On Arrival in Japan, Turn Data Roaming ON
Here is the part that trips up first-timers. A travel eSIM connects to a partner network in Japan, and to your iPhone that counts as roaming, even though there are no roaming fees on the plan. If Data Roaming is off, the eSIM shows no data. So when you land:
- Open Settings > Mobile Service.
- Tap your Japan Travel line.
- Turn Data Roaming ON for that line.
To be clear, this switches on roaming only for the eSIM. It does not touch your home line, so you are in no danger of running up expensive home-network roaming charges. Give it a moment after you land, and you should see the Japanese network name and a few bars on the eSIM line.
Step 5: Choose the eSIM as Your Data Line (Dual SIM)
The final piece is telling your iPhone to use the Japan eSIM for mobile data while keeping your home line for calls and texts. This is the standard travel dual SIM setup:
- Go to Settings > Mobile Service > Mobile Data (or Mobile Data).
- Select Japan Travel as the data line.
- Turn OFF "Allow Mobile Data Switching." That toggle lets iPhone quietly fall back to your home line, which is exactly the roaming bill you are trying to avoid.
Now your data runs on the Japanese network at local speeds, while your home number stays reachable for the occasional call or verification text. Because eSIMpass is data-only, you make calls over apps - WhatsApp, FaceTime, or LINE, which is the messaging app nearly everyone in Japan uses. Set up LINE before you go if you are meeting friends or booking tours locally.
If you would rather browse the general iPhone-specific details, our eSIM for iPhone page covers model compatibility and settings in more depth. And for how setup differs across phones, see eSIM setup: iPhone vs Android differences.
Common Mistakes to Avoid
A few errors account for almost every "my eSIM is not working" message. Check these first:
- Waiting until Japan to install. You need Wi-Fi to download the profile. If you did not install at home, use free airport or hotel Wi-Fi at Haneda, Narita, or Kansai to complete the QR scan, then proceed.
- Data Roaming left off. The most common issue by far. The travel line needs Data Roaming ON to work. Your home line does not.
- Wrong data line selected. If pages will not load, confirm Mobile Data is pointed at your Japan eSIM, not your home SIM.
- Deleting the eSIM by accident. Do not remove the profile to "reset" it. Once deleted, the QR code usually cannot be reused and you would need a replacement. Toggle Airplane Mode instead if you need to reconnect.
- Leaving Mobile Data Switching on. This silently hands data back to your home network and can trigger real roaming charges. Turn it off.
- Expecting a Japanese phone number. A data-only plan has none by design. Use your home number plus calling apps, which is all most travellers need anyway.
Frequently Asked Questions
Which iPhones support a Japan eSIM?
Every eSIM-capable iPhone, which means the iPhone XR, XS, and XS Max and every model since, including SE (2020) and newer. If your iPhone is network-unlocked and running a reasonably current iOS version, you are set. You can double check on our compatible devices page.
Can I install the eSIM after I arrive in Japan?
Yes, but you need Wi-Fi to do it, because installing downloads the profile over the internet. Haneda, Narita, and Kansai airports all have free Wi-Fi, as do most hotels and convenience stores. It is far less stressful to install at home before you fly, which is why that is step two of this guide.
Do I lose my normal phone number while using the eSIM?
No. The Japan eSIM is a second line, so your home SIM stays active for calls and texts on your usual number. You simply set the eSIM as your data line. Keep your home line as the default for voice and iMessage and you stay reachable as normal.
Why does my eSIM show no data even though it installed?
Almost always because Data Roaming is off on the travel line. Go to Settings > Mobile Service, tap your Japan Travel line, and turn Data Roaming ON. Also confirm that same line is selected under Mobile Data. Those two settings fix the vast majority of cases. If not, our full Tokyo data troubleshooting guide runs through every remaining fix.
Does the eSIM give me a Japanese number for calls and bookings?
No, eSIMpass plans are data-only, so there is no phone number attached. For calls, use WhatsApp, FaceTime, or LINE over the data connection. LINE in particular is worth installing before your trip since it is the standard messaging app in Japan for restaurants, tours, and local contacts.
When do my plan days start counting?
On per-GB plans, validity begins when the eSIM first connects to a network in Japan, not when you install it - which is why installing at home a day or two early costs you nothing. On Unlimited plans, validity runs on the travel dates you select at checkout - installing early costs nothing there either, but the days count from your chosen start date whether the eSIM is installed or not, so never leave the install past that date. Confirm the exact terms on your plan, since they vary by plan type.
Ready to land in Tokyo already connected?
Install your Japan eSIM at home in three minutes, then just flip Data Roaming on when you arrive. Instant QR delivery, no activation fee.
Get Your Japan eSIM
