How to Use Your iPhone in Japan

To use your iPhone in Japan with a travel eSIM, check that it supports eSIM and is carrier-unlocked, install a plan valid for your trip, and select it for cellular data. Keep data roaming off on your home line, and follow the travel provider’s instructions for roaming on the Japan line.

You can also use your home carrier’s Japan roaming offer or connect to pocket WiFi. A compatible physical SIM is an option only if your iPhone has a SIM tray and can accept that provider’s SIM. Compare the eSIM, pocket WiFi and physical SIM options before choosing, or use our Japan eSIM comparison to shortlist a travel plan.

This guide covers each step in order: whether your iPhone can use an eSIM, how to confirm it is unlocked, the three ways to install a plan, the settings to change for Japan, and what to try if the line will not connect. Menu names below follow Apple’s US wording. Some regions say Mobile Data or Mobile Service instead of Cellular.

Does my iPhone support eSIM?

Yes, if you have an iPhone XS, iPhone XS Max, iPhone XR or a later model. Apple lists those as the minimum on its Set up eSIM on iPhone page. There are regional exceptions. Apple notes that in China mainland only certain recent models support eSIM, and some models sold in Hong Kong and Macao use two physical nano-SIM cards instead. If your iPhone was bought in one of those places, check Apple’s page for your exact model.

Supported iPhones can hold more than one eSIM, and Apple’s guide to using eSIM while traveling internationally explains that supported models can keep two lines active at once. That is what lets you keep your home number on one line while the Japan plan provides data on the other.

eSIM-only iPhones

Apple states that since the introduction of iPhone 14, iPhone models purchased in the United States do not have a SIM tray. That is on its iPhone SIM tray page. If you bought a US iPhone 14 or later, a physical Japanese SIM card is not an option, so an eSIM, a roaming plan from your carrier or a pocket WiFi device are your choices. Models sold elsewhere may still have a tray; check yours before assuming either way.

Check your iPhone is carrier-unlocked

A phone bought on contract or with a carrier discount may only accept that carrier’s plans. A travel eSIM will not work on a locked phone, and the installation can appear to succeed before the line fails to connect.

To check, open Settings > General > About and look at Carrier Lock. Apple’s guide to unlocking your iPhone for a different carrier says that if it reads “No SIM restrictions”, the iPhone is unlocked. If you see anything else, contact your carrier. Apple notes that only your current carrier can unlock the phone, so allow time before your trip: unlock requests are not always instant.

What to have ready before installing

• A reliable internet connection. Install the eSIM at home or at the hotel on WiFi, not in an airport arrivals hall.
• The installation details. Depending on the provider, that is a QR code, an installation link, the provider’s app or a set of manual details. If you are scanning a QR code, display it on another screen or print it, because your iPhone’s camera cannot scan its own screen.
• The plan’s start rule. Some plans start counting days when you install them; others start on first connection to a network in Japan. Read the rule before installing so you do not lose days.
• Your home line left alone. Do not delete or replace your home SIM or eSIM. Some accounts need texts to it for sign-in codes while you travel.

How to install a Japan eSIM on iPhone

Your provider’s instructions will say which of these applies.

Option 1: Scan a QR code

1. Open the Camera app and point it at the QR code.
2. Tap the Cellular Plan Detected notification when it appears.
3. Tap Continue, then Add Cellular Plan. Enter a confirmation code only if the provider sent one.

If the QR code arrives in an email or browser on the iPhone itself, Apple says you can touch and hold the code, then tap Add eSIM. You can also start from Settings > Cellular > Add eSIM and choose Use QR Code.

Option 2: Use an installation link or the provider’s app

Many providers offer a one-tap installation link or an in-app install button. On iOS 17.4 or later, Apple says tapping a carrier link opens an Activate New eSIM prompt: tap Allow, then Continue.

Option 3: Enter the details manually

If the QR code will not scan, go to Settings > Cellular > Add eSIM, choose the QR code option, then tap Enter Details Manually and type the SM-DP+ address and activation code your provider sent. Copy them exactly; a single wrong character will fail.

Set up both lines for Japan

Once the plan is installed, the iPhone asks a few questions about how to use your two lines. You can change all of these later in Settings > Cellular. Apple’s Dual SIM with eSIM guide covers each option.

1. Label the lines. Give the new line a clear label, such as Japan, and keep your home line as Primary.
2. Choose the default line for calls and texts. Most travelers keep the home line as the default, so their number stays reachable for texts. Check your home carrier’s roaming charges for incoming calls and texts.
3. Set Cellular Data to the travel line. In Settings > Cellular > Cellular Data, select the Japan line. Only one line can be used for data at a time.
4. Turn off Allow Cellular Data Switching. This setting lets the iPhone use data from either line depending on coverage. Leave it off so data cannot quietly move to your home line and trigger roaming charges.
5. Turn Data Roaming on for the travel line only. Tap the Japan line, then turn on Data Roaming if your provider’s instructions say so. Many travel eSIMs connect as roaming services, so the line will not work with it off. Apple’s cellular data roaming options page explains the setting.
6. Turn Data Roaming off for your home line. Tap the home line and make sure Data Roaming is off, unless you intend to pay for your carrier’s roaming.

On iOS 26 and later, Apple says the iPhone may show a Turn On Travel eSIM prompt when you arrive, letting you choose to use the travel eSIM alone or alongside your current line. If you see it, the same principle applies: data on the travel line, roaming off on the home line.

iMessage and FaceTime can stay on your home number while data runs over the travel line. If you need a Japanese number for calls or bookings, read our guide to Japan eSIM plans with a phone number first, because most travel plans are data-only.

When to install and when to switch the line on

The safest pattern is to install the eSIM a day or two before you fly, while you have WiFi and time to fix anything. If the plan starts on first connection, you can turn the travel line off in Settings > Cellular after installing and switch it on after landing. If the plan starts on installation, wait until closer to departure to install it.

After landing, turn the travel line on, check that it is selected for cellular data, and wait a minute or two for it to register on a Japanese network. Load an ordinary webpage to confirm it is working before you leave the airport WiFi.

Troubleshooting a Japan eSIM on iPhone

Work through these in order.

• No service or SOS only. Check that the travel line is turned on and Data Roaming is on for that line. Apple’s roaming page lists this as the first thing to check.
• Signal bars but no internet. Confirm Settings > Cellular > Cellular Data is set to the travel line. If the provider lists APN settings, enter them where its instructions say, usually in the line’s Cellular Data Network settings.
• Still not connecting. Toggle Airplane Mode on and off, or restart the iPhone. In the line’s Network Selection setting, try automatic selection if it is set manually.
• “SIM not supported” or the plan will not install. This usually points to a carrier lock or an incompatible model. Recheck Carrier Lock in Settings > General > About.
• Data running out fast. Look at usage by app under Settings > Cellular and turn on Low Data Mode for the travel line. Our Japan data calculator helps you check whether the plan was large enough in the first place.

Do not delete the eSIM while troubleshooting. Many travel eSIMs can only be installed once, and deleting one can mean buying another. Contact the provider’s support first and keep your order email handy.

After your trip

When you get home, Apple says iOS 26 and later usually turns the travel eSIM off and your home line back on automatically, depending on your country or region. If it does not, go to Settings > Cellular, make sure Turn On This Line is enabled for your home line and select it for cellular data again. You can delete the travel eSIM once its plan has ended and you no longer need it.

If you have not chosen a plan yet, compare allowance and validity on our Japan eSIM comparison before buying. Android users can follow the Android setup guide instead.