Setup Guide

How to Install an eSIM for Japan: 2026 Setup Guide

July 20269 min readBy Daniel Mercer, Lead eSIM Analyst

2 networks tested
5 providers compared
Updated June 2026

Daniel Mercer

Lead eSIM Analyst

43 countries tested280 plans reviewed14 airports tested8 years in telecom

Previously at Analysys Mason covering APAC mobile markets (2016-2021)

How we test

Published July 2026 · Updated June 2026

Compatibility

Check your device for Japan eSIM

iPhone

Supported models: iPhone XR, XS, 11 through 16 Pro Max, and SE (3rd generation). Requires iOS 16 or later. iPhones hold up to 8 eSIM profiles with 2 active simultaneously. Check carrier lock: Settings > General > About > Carrier Lock. 5G eSIM requires iPhone 12 or newer.

Android

Supported: Samsung Galaxy S21 and later (S22-S25, Z Flip/Fold series), Google Pixel 3+, Xiaomi 12T Pro and later. Requires Android 10 or later. eSIM profile limits vary: Samsung holds 5-8 profiles, Pixel supports 8+. 5G on NTT docomo requires Samsung S22+ or Pixel 6+.

Is your phone unlocked?

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Full device compatibility list · Check carrier unlock status

Providers

Japan provider options and pricing

Nomad (Recommended)

Nomad is the recommended provider for Japan with a 4.1/5 rating. Best Budget pick. Plans available: 1GB, 3GB, 5GB, 10GB, 20GB plus unlimited daily options. Installation via QR code delivered by email.

Overall

Install: 4.2/5 · QR Flow: 4/5

Docs: 3.9/5 · Reliability: 4.2/5

Nomad full review

Alternative providers

eSIM providers for Japan
Provider	Per GB	Rating	Best For
Nomad#1 Pick	from $3.00/GB	4.1/5	Best Budget
Airalo	from $4.50/GB	4.5/5	Best Overall
Saily	from $3.99/GB	4.4/5	Best Privacy
HelloRoam	from around $3.50 per gigabyte	4.4/5	Coverage + Value
Holafly	from $2.99/day	4.3/5	Best Unlimited

Which provider to choose

Budget travel: Nomad offers the lowest per-GB rate
Broadest coverage: Airalo covers 200+ countries on one account
Unlimited data: Holafly removes the data counter entirely
Privacy: Saily bundles NordVPN under the same account

Installation

Japan eSIM installation guide

iOS installation (iPhone)

Open Settings > Cellular > Add eSIM
Select "Use QR Code"
Scan the QR code from your Nomad confirmation email
Label the plan (e.g., "Japan Travel")
Set as cellular data line (not your default for calls)
Do NOT enable data roaming yet
Confirm the plan appears under Settings > Cellular

iOS 18: the "Add eSIM" option appears under Settings > Cellular > Add Cellular Plan. iOS 17 and earlier: Settings > Cellular > Add eSIM.

Android installation (Samsung One UI)

Open Settings > Connections > SIM Manager > Add eSIM
Select "Download SIM" then "Scan QR code"
Scan the QR code from your Nomad confirmation email
Name the profile (e.g., "Japan Data")
Set as mobile data SIM
Do NOT enable data roaming yet
Verify the plan in SIM manager

Manual installation (if QR fails)

If the QR code does not scan, use manual entry:

Go to Settings > Cellular > Add eSIM
Select "Enter Details Manually"
Enter the SM-DP+ address from your provider email
Enter the activation code
Complete the setup as with the QR method

Use manual entry when: camera cannot read the QR code, the email was forwarded without the image, or you are installing on a second device.

Configuration

Network configuration for Japan

Automatic APN configuration

Most eSIM profiles auto-configure APN settings for NTT docomo's network. After installation, verify the APN is set correctly:

iPhone: Settings > Cellular > Cellular Data Options > Cellular Data Network
Android: Settings > Network & Internet > SIMs > (travel eSIM) > Access Point Names

A correctly configured APN shows the carrier name and data type. If the APN field is blank, your phone will attempt to auto-fill on first connection.

Manual APN entry

If auto-configuration fails (rare, typically older Android devices), enter APN settings manually. Check your provider's confirmation email for the exact values. Common fields:

APN configuration fields
Field	Value
APN Name	From provider email
APN	Provider-specific value
Authentication	None (most providers)
APN Protocol	IPv4/IPv6

Provider-specific APN values override NTT docomo's carrier defaults. Always use the values from your provider, not generic carrier APNs.

5G and LTE band selection

5G is available in Japan (widespread coverage). To force a network type:

iPhone: Settings > Cellular > Cellular Data Options > Voice & Data > 5G Auto / LTE
Android: Settings > Network > Preferred network type > 5G/LTE/3G Auto

Switch to LTE-only to conserve battery in rural areas without 5G towers. 99.2% population coverage as of 2025; all four carriers actively expanding

Verification

Japan eSIM connection verification

Signal and network verification

Check your status bar: the carrier name should show NTT docomoor a roaming indicator. Signal bars confirm connection strength. Go to Settings > Cellular to verify data usage is counting on the travel eSIM line.

"NTT docomo" or roaming icon: Connected and working
"Searching...": Still connecting, wait 2-3 minutes
"No Service": Data roaming is off or wrong SIM line selected

Speed test

Run fast.com or Speedtest.net to verify your connection speed. Expected speeds on NTT docomo: approximately 225 Mbps download. Speeds vary by location: airports and city centers are fastest, rural areas slower.

Verifying data roaming is active

Go to Settings > Cellular > (travel eSIM) > Data Roaming: ON. Test by opening any website in your browser. If it loads, roaming is active. If not, toggle data roaming off and back on, then restart your phone.

Dual-SIM verification

Confirm your home SIM still receives calls and texts. Confirm the travel eSIM handles all data traffic. Test: send yourself a text message to your home number. Then load a webpage. Both should work simultaneously. If data routes through the home SIM instead, switch your cellular data line to the travel eSIM.

Airport Guide

Arriving at Narita (NRT) / Haneda (HND) with your eSIM

Before boarding

Install your Japan eSIM at home the night before departure. Open Settings on your phone, add the eSIM profile via QR code over your home WiFi, and leave it toggled off. The plan clock does not start until NTT docomo's network registers the profile after you land. Airport WiFi at Narita (NRT) / Haneda (HND) is unreliable for eSIM installation — boarding-gate networks often block the download entirely.

During the flight

Airplane mode stays on until you land. Use the flight time to verify your eSIM configuration: the Japan profile should be your active data line, and data roaming for that line should be ready to toggle on after touchdown.

After landing

Disable airplane mode after landing. Toggle the Japan eSIM on and enable data roaming for that line. NTT docomo's 5G/LTE network picks up your profile in 30-45 seconds. Verify by loading any webpage. The SIM counter from Bic Camera and NINJA WiFi is in the arrivals hall — expect a 5-15 min; vending machines available 24/7 wait and $20-50 for 5-15GB / 7-30 days for a tourist plan. Walk past it.

Leaving the airport

Navigate the airport with live data. Check transit schedules, verify your hotel booking confirmation, and message your host — all before you exit the terminal. NTT docomo's 5G/LTE signal covers the airport grounds. Japan's emergency number is 110/119 — it works without data, but having your eSIM active means you can also share GPS coordinates with emergency services.

Device Setup

Device-specific instructions for Japan

iPhone (iOS 17+)

Open Settings > Cellular > Add eSIM > Use QR Code.
Point the camera at the QR code from your provider's email. The profile downloads in 5-15 seconds on stable WiFi.
Tap "Add Cellular Plan" when prompted. Label the plan "Japan Data" to distinguish it from your home line.
Go to Settings > Cellular > Cellular Data and select the Japan eSIM as your active data line.
Turn on Data Roaming for the Japan line only: Settings > Cellular > [Japan Data] > Data Roaming > On.
After landing at Narita (NRT) / Haneda (HND), toggle the eSIM on. NTT docomo registers your profile in 60-90 seconds. If data does not connect after 3 minutes, add the APN manually: go to Cellular Data Network and enter APN: "spmode.ne.jp". Leave username and password blank.
Verify: open Safari and load any webpage. If the page renders, your Japan data is active at 225 Mbps average.

Carrier confirmation: Your status bar should display "NTT docomo" or "KDDI/au" with 5G/LTE signal within 60-90 seconds. On iPhone, check Settings > Cellular — the Japan line shows "NTT docomo" under Network. If you see "5G" in the status bar, your phone has connected to NTT docomo's 5G band.

Note: If the carrier field shows "No Service" after 2 minutes, go to Settings > Cellular > Network Selection, turn off Automatic, wait 10 seconds, then turn it back on. If NTT docomo does not appear in the list, restart your iPhone (hold Side + Volume Down for 3 seconds, slide to power off, wait 30 seconds, power on).

Samsung Galaxy (One UI 6+)

Open Settings > Connections > SIM Manager > Add eSIM.
Select "Scan QR Code" and frame the QR code from your provider's email. The download completes in 5-15 seconds.
Tap "Add" when the carrier profile loads. Label it "Japan Data" under SIM Manager for clarity.
Set the Japan eSIM as your mobile data SIM: Settings > Connections > SIM Manager > Mobile Data > select Japan eSIM.
Enable Data Roaming: Settings > Connections > Mobile Networks > Data Roaming > On (for the travel SIM only).
After landing at Narita (NRT) / Haneda (HND), enable the eSIM. NTT docomo's 5G/LTE network registers within 60-90 seconds. If data does not connect within 3 minutes, enter the APN manually: Settings > Connections > Mobile Networks > Access Point Names > Add. Name: NTT docomo, APN: "spmode.ne.jp". Save and select it as active.
Verify: open Chrome and load any page. Data flowing confirms your Japan eSIM is active.

Carrier confirmation: Your status bar should display "NTT docomo" or "KDDI/au" with 5G/LTE signal within 60-90 seconds. On Samsung, check Settings > Connections > SIM Manager — the travel SIM shows "NTT docomo" as the connected network. A "5G" icon in the status bar confirms NTT docomo's 5G connection.

Note: If "No Service" persists after 2 minutes, go to Settings > Connections > Mobile Networks > Network Operators, switch from Automatic to Manual, wait for the scan to complete, then select NTT docomo. If the carrier does not appear, restart the device: hold Power + Volume Down until the restart menu appears.

Google Pixel (Android 14+)

Open Settings > Network & Internet > SIMs > Add SIM > Download SIM.
Scan the QR code from your eSIM provider's email. The profile downloads in under 15 seconds.
Confirm the download and label the SIM "Japan Data" for identification.
Set as mobile data SIM: Settings > Network & Internet > SIMs > Japan Data > Use for mobile data.
Enable roaming: Settings > Network & Internet > SIMs > Japan Data > Roaming > On.
After landing at Narita (NRT) / Haneda (HND), enable the profile. NTT docomo connects within 60-90 seconds. If data fails to connect, add the APN: Settings > Network & Internet > SIMs > [Japan eSIM] > Access Point Names > New APN. Name: NTT docomo, APN: "spmode.ne.jp". Save and set as default.
Open Chrome and load any page to verify data connectivity on NTT docomo's 5G/LTE network.

Carrier confirmation: Your status bar should display "NTT docomo" or "KDDI/au" with 5G/LTE signal within 60-90 seconds. On Pixel, check Settings > Network & Internet > SIMs — the travel SIM displays "NTT docomo" as the active network.

Note: If the signal does not register within 2 minutes, go to Settings > Network & Internet > SIMs > Japan Data > Advanced > Choose network, switch to Manual, let the scan run, and select NTT docomo. If it fails, reset network settings under Settings > System > Reset options > Reset Mobile, WiFi & Bluetooth.

Carrier Config

Carrier troubleshooting for Japan

NTT docomo

APN: "spmode.ne.jp" — enter under Settings > Cellular > Cellular Data Network (iPhone) or Settings > Connections > Mobile Networks > Access Point Names (Samsung). Leave username, password, and proxy fields blank. Save and restart data.

Network selection: Open Settings > Cellular > Network Selection (iPhone) or Settings > Connections > Mobile Networks > Network Operators (Samsung). Turn off Automatic. Wait 10-30 seconds for the carrier list to populate. Select "NTT docomo" from the list. The phone locks onto NTT docomo's 5G/LTE band and data resumes within 30 seconds.

Expected speed: 203-225 Mbps in urban areas, 68-113 Mbps in rural coverage

Common issue: NTT docomo may show a signal bar but no data if the APN was not auto-configured. This happens on roughly 10-15% of Japan eSIM activations. Enter APN "spmode.ne.jp" manually under Cellular Data Network settings.

Resolution: Reset network settings: Settings > General > Transfer or Reset > Reset Network Settings (iPhone) or Settings > General Management > Reset > Reset Network Settings (Samsung). This clears saved WiFi passwords but resolves most NTT docomo registration failures. Re-enable the Japan eSIM after the reset completes.

KDDI/au

APN: "uno.au-net.ne.jp" — enter under Settings > Cellular > Cellular Data Network (iPhone) or Settings > Connections > Mobile Networks > Access Point Names (Samsung). Leave username, password, and proxy fields blank. Save and restart data.

Network selection: Open Settings > Cellular > Network Selection (iPhone) or Settings > Connections > Mobile Networks > Network Operators (Samsung). Turn off Automatic. Wait 10-30 seconds for the carrier list to populate. Select "KDDI/au" from the list. The phone locks onto KDDI/au's 5G/LTE band and data resumes within 30 seconds.

Expected speed: 135-191 Mbps in cities, 45-90 Mbps outside metro areas

Common issue: If KDDI/au connects but web pages time out, the phone may have defaulted to your home SIM for data. Go to Settings > Cellular > Cellular Data and confirm the Japan eSIM is selected. The home SIM handles calls only.

Resolution: Contact your eSIM provider's support with the SM-DP+ activation address from your confirmation email. Some KDDI/au profile issues require a new QR code. Airalo responds via in-app chat in under 5 minutes; Holafly offers WhatsApp support at +34 644 44 37 97.

SoftBank

APN: "plus.4g" — enter under Settings > Cellular > Cellular Data Network (iPhone) or Settings > Connections > Mobile Networks > Access Point Names (Samsung). Leave username, password, and proxy fields blank. Save and restart data.

Network selection: Open Settings > Cellular > Network Selection (iPhone) or Settings > Connections > Mobile Networks > Network Operators (Samsung). Turn off Automatic. Wait 10-30 seconds for the carrier list to populate. Select "SoftBank" from the list. The phone locks onto SoftBank's 5G/LTE band and data resumes within 30 seconds.

Expected speed: 135-191 Mbps in cities, 45-90 Mbps outside metro areas

Common issue: SoftBank's network occasionally delays eSIM profile registration during peak hours at major airports. If your phone shows "Searching..." for more than 2 minutes, turn off Automatic network selection, wait 10 seconds, then select SoftBank manually from the operator list.

Resolution: Restart your phone after adjusting network settings. SoftBank typically completes registration within 60-90 seconds of a fresh boot. If the issue persists, remove and re-add the eSIM profile using the manual activation code from your provider's confirmation email.

Dual SIM

Running two SIMs in Japan: data line vs call line

Data line setup

Open Settings > Cellular and tap "Cellular Data." Select the Japan eSIM. All data now routes through NTT docomo's local network at local rates. Do not enable "Allow Cellular Data Switching" — that setting lets the phone fall back to your home SIM for data, which triggers international roaming fees without warning.

Calls and SMS

The home SIM stays on for calls and verification texts. When someone dials your regular number, it rings normally. Standard SMS charges from your home carrier may apply for receiving texts abroad — check your plan. All internet-based communication routes through NTT docomo's data network on the Japan eSIM.

Emergency dialing

Emergency services in Japan are reached at 110/119. Both your home SIM and the travel eSIM can place this call. Data from the eSIM adds GPS location sharing, real-time translation for language barriers, and the ability to look up your embassy's local address and phone number.

Battery impact

Running two SIMs draws 10-15% more battery per day than a single SIM. Both radios maintain separate network connections. If your battery runs low during the day, disable the home SIM temporarily under Settings > Cellular — the Japan eSIM is the priority line for data. Re-enable the home SIM when you reach WiFi at your hotel. Japan uses Type A/B outlets — carry the right adapter.

Hotspot

Share your Japan eSIM data with other devices

Personal hotspot works with most Japan eSIM plans from major providers. Enable it under your phone's settings. The hotspot shares your NTT docomo 5G/LTE connection with nearby devices via WiFi, Bluetooth, or USB. WiFi tethering has the widest range (roughly 10 meters) but uses more battery. USB tethering charges your phone while sharing data — ideal for laptop sessions. Expect 135-180 Mbps typical through hotspot on the connected device.

Provider restrictions

Hotspot availability is a plan feature, not a country restriction. Most fixed-data Japan plans support tethering. Unlimited plans are the exception — carriers throttle or block hotspot on unlimited tiers to manage network load on NTT docomo's infrastructure. If you need hotspot, buy a fixed-data plan with an explicit hotspot label.

Data impact

Tethering multiplies data use. A single Zoom call uses 300-500 MB/hour. Slack with screen sharing adds 200-400 MB/hour. Background cloud sync on a connected laptop can consume 500 MB-1 GB without any visible activity. Before hotspotting in Japan, disable auto-sync and set video calls to audio-only when possible — that drops consumption by 70%.

Peak Season

Japan peak season: Mar-Apr, Oct-Nov network advisory

Mar-Apr, Oct-Nov is Japan's busiest travel period. Cherry blossom season (late March-early April) and autumn foliage (October-November) draw peak crowds. NTT docomo's towers in tourist hotspots carry 2-3x the normal load. Expect 90-135 Mbps during peak congestion. Essential apps (maps, messaging, email) work fine. Schedule video calls for early morning or late evening when network traffic is lightest.

Connect to Japan's 5G network via eSIM

Japan has widespread 5G coverage across major cities and airports on NTT docomo's network. 99.2% population coverage as of 2025. To use 5G with your eSIM, verify your phone supports 5G (iPhone 12 or later, Samsung Galaxy S21 or later, Pixel 5 or later). Go to Settings > Cellular > Cellular Data Options > Voice & Data > 5G Auto (iPhone) or Settings > Connections > Mobile Networks > Network Mode > 5G/LTE/3G/2G (Samsung). Average download speed on NTT docomo's 5G: 225 Mbps. 5G drains battery 10-20% faster than LTE. Switch to LTE if battery life is more important than speed.

WiFi Backup

Japan WiFi availability for eSIM setup

Japan offers excellent public WiFi (fast and widely available). Free WiFi at stations, convenience stores, and most cafes. Install your eSIM before leaving home. The download is tiny (under 1 MB) but requires an uninterrupted HTTPS connection to the carrier's provisioning server. Public WiFi with captive portals — including Narita (NRT) / Haneda (HND)'s network — can block this connection. Home WiFi eliminates the risk.

Activating without WiFi

No WiFi for QR scan? Use manual activation. Check your provider's email for the SM-DP+ address (a URL starting with "smdp+") and the matching activation code. On iPhone: Settings > Cellular > Add eSIM > Enter Details Manually. On Samsung: SIM Manager > Add eSIM > Enter Activation Code. You can use your home carrier's mobile data for this — it transfers less than 1 MB.

Multi-Country

Multi-stop itinerary: Japan eSIM alongside other profiles

For a multi-stop Asian itinerary, install one eSIM per country before departure. Japan's eSIM connects to NTT docomo's 5G/LTE network directly, avoiding the speed penalty that multi-country roaming eSIMs carry. At the Japan border, disable your previous eSIM and enable the Japan profile. The process: Settings > Cellular, toggle off the old line, toggle on the new one. Done in 30 seconds.

Switching eSIM profiles between countries

Border crossing procedure: disable the previous eSIM, enable Japan. iPhone: Settings > Cellular > tap each line to toggle. Samsung: Settings > Connections > SIM Manager > toggle lines. Confirm Japan is the active data line. Enable data roaming. NTT docomo's 5G/LTE signal registers in 60-90 seconds. The entire switch takes 30 seconds.

Fixes

Troubleshooting Japan eSIM setup

"eSIM Not Supported" error

Cause: Your phone is carrier-locked or the model does not support eSIM.

Fix: Contact your home carrier to unlock (24-72 hours). Verify your model supports eSIM at our compatibility list.

"Unable to Activate eSIM" error

Cause: eSIM profile slot is full, or the QR code was already redeemed.

Fix:Delete unused eSIM profiles in Settings > Cellular. iPhones hold 8 profiles (2 active). If the QR shows as used, contact your provider for a replacement code.

Connected but no data

Cause: Data roaming is off on the travel eSIM, or data is routing through the home SIM.

Fix:Settings > Cellular > select travel eSIM > Data Roaming ON. Also verify: Settings > Cellular > Cellular Data > select the travel eSIM as your data line. Restart your phone after making changes.

Slow speeds on NTT docomo

Expected: 225 Mbps. If speeds are noticeably lower: toggle airplane mode on and off. Move to a different area. Try forcing LTE if 5G is congested. During Mar-Apr/Oct-Nov speeds may drop in tourist areas.

Provider-specific installation issues

Airalo: QR code in email and in-app. Re-download available in the app under "My eSIMs"
Nomad: QR delivered by email only. Check spam folder. No app required for installation
Holafly: QR code in app and email. Unlimited plans activate on first connection
Saily: QR in app. VPN configuration separate from eSIM setup

Full troubleshooting guide · Transfer eSIM to new phone

Quick Answers

Common setup questions for Japan

FAQ

Frequently asked: Japan eSIM setup

How do I install an eSIM for Japan on iPhone?

Open Settings > Cellular > Add eSIM > Use QR Code. Scan the code from your provider email. Label the plan "Japan Travel" and set it as your cellular data line. The process takes about 5 minutes over WiFi.

How do I install an eSIM for Japan on Android?

Open Settings > Connections > SIM Manager > Add eSIM. Select "Download SIM" then "Scan QR code". Scan the QR code from your provider email. Name the profile "Japan Data" and set it as your mobile data SIM. Steps vary slightly between Samsung One UI and other Android versions.

What APN settings do I need for Japan?

Most eSIMs auto-configure APN for NTT docomo's network. If auto-config fails, check your provider's confirmation email for manual APN values. Go to Settings > Cellular > Cellular Data Options > Cellular Data Network to verify or enter settings manually.

Can I install the eSIM before my trip to Japan?

Yes. Install at home over WiFi any time before departure. Do not enable data roaming until you land in Japan. Plans count from the first network connection, not from installation. Installing early is recommended.

How many eSIM profiles can my phone hold?

iPhone holds up to 8 eSIM profiles with 2 active simultaneously. Android varies by manufacturer: Samsung supports 5-8, Google Pixel supports 8+. Delete unused profiles in Settings > Cellular to make room for new ones.

What if the QR code does not work for Japan?

Use manual activation: Settings > Cellular > Add eSIM > Enter Details Manually. Find the SM-DP+ address and activation code in your provider email. This method works when the camera cannot read the QR code or when using a forwarded email.

How do I know my eSIM is connected to NTT docomo?

Check the status bar for "NTT docomo" or a roaming indicator. Run a speed test at fast.com. Expected speeds: approximately 225 Mbps. If you see "No Service," enable data roaming on the travel eSIM line.

Does Japan support 5G eSIM?

5G coverage in Japan is widespread. 99.2% population coverage as of 2025; all four carriers actively expanding To use 5G, your phone must support it (iPhone 12+ or Samsung S21+) and your eSIM plan must include 5G access.

How to test eSIM before traveling to Japan?