Using a Galaxy S23 in Japan: eSIM Setup & Internet Guide
π―π΅ Galaxy S23 works in Japan
- β Fully compatible with NTT Docomo, SoftBank, and au (KDDI)
- β eSIM installs in 2 minutes β no SIM swap needed
- β US carrier models may be locked β confirm before traveling
- β Supports 2 active eSIMs β keep your home SIM active
Recommended eSIM Plans for Japan
See all plans βπ Global - 0.4883GB / 3 Days
Asialink
0.4883 GB Β· 3 days
π Global - 0.1953GB / 30 Days
Discover
0.1953 GB Β· 30 days
π Global - 1.0GB / 5 Days
Discover
1 GB Β· 5 days
π Global - 0.4883GB / 3 Days
Eurolink
0.4883 GB Β· 3 days
Prices shown for Free tier. Pro members save 7%, Premium save 12%.
Ask AI: Which Japan Plan Works Best for Galaxy S23?
Ask Smart Coach about the best eSIM plans for Japan, compare carriers, get installation help, and more.
Galaxy S23 compatibility in Japan
Network band compatibility
Galaxy S23 supports LTE B1, B2, B3, B4, B5, B7, B8, B12, B13, B17, B20, B25, B26, B28, B38, B40, B41, B66. Snapdragon 8 Gen 2 modem. Strong global band coverage including B19 for Japan and B20 for Europe.
SIM configuration
Galaxy S23 supports nano-SIM + eSIM. US carrier variants may be locked β check before traveling or buy unlocked. Use Settings β Connections β SIM Manager to add an eSIM, not the regular Connections menu. Samsung's eSIM UI is different from stock Android.
Active eSIMs
2
Stored profiles
Up to 10
Physical SIM
Yes
Carrier lock risk
Check first
How to install your Japan eSIM on Galaxy S23
Complete these steps at home over Wi-Fi before your flight. Takes 2β3 minutes.
- 1
Open Settings β Connections β SIM Manager β Add eSIM
- 2
Select "Scan QR code from service provider"
- 3
Scan the QR code from your LTE.app order confirmation
- 4
Follow the on-screen prompts to complete installation
- 5
Set as your data SIM when you arrive at your destination
- 6
After landing in Japan, go to Settings and switch on your LTE.app eSIM line. Your phone connects to NTT Docomo, SoftBank, and au (KDDI) automatically.
What happens when you land in Japan
- 1
Install your eSIM on Galaxy S23 before your trip
Scan the QR code from your LTE.app order at home over Wi-Fi. Takes 2β3 minutes. Your home SIM stays active and untouched throughout.
- 2
Land at Narita International Airport
After your flight, disable Airplane Mode. Open Settings β Connections β SIM Manager and enable your LTE.app eSIM line.
- 3
Connect to NTT Docomo, SoftBank, and au (KDDI)
Your Galaxy S23 automatically connects to Japan's LTE network. Japan has some of the best urban LTE coverage in the world. NTT Docomo reaches over 99% of the population. Rural coverage is also strong in most regions, though deep mountain areas can have gaps.
- 4
Maps, messaging, and apps work immediately
Navigation, translation, ride-hailing, and messaging apps all work the moment you exit the arrivals hall β no queuing, no SIM swap.
Roaming vs eSIM in Japan: cost comparison
Roaming your home carrier in Japan costs significantly more than a local eSIM.
AT&T and Verizon international passes cost $10β12/day with hard data caps. Roaming overages can reach $10/MB on some plans.
US carriers like AT&T charge $12/day for limited daily data; after the cap, speeds drop to 128 Kbps β barely usable. Japanese tourist SIM cards from IIJmio (available at Bic Camera, Yodobashi Camera) cost $12β20 for 1 week. An LTE.app eSIM for Japan on NTT Docomo or SoftBank costs $8β15 for the same week β with faster setup and no physical card to manage.
LTE coverage in Japan for Galaxy S23 users
Japan uses LTE bands 1, 3, 8, 11, 18, 19, 21, and 28. All modern iPhones and Android flagships support these. Older or budget phones may miss band 19 (NTT Docomo's main rural band).
Japan has some of the best urban LTE coverage in the world. NTT Docomo reaches over 99% of the population. Rural coverage is also strong in most regions, though deep mountain areas can have gaps.
Frequently asked questions β Galaxy S23 in Japan
Is the Galaxy S23 compatible with Japan's mobile network?
Yes. Galaxy S23 supports LTE B1, B2, B3, B4, B5, B7, B8, B12, B13, B17, B20, B25, B26, B28, B38, B40, B41, B66. Snapdragon 8 Gen 2 modem. Strong global band coverage including B19 for Japan and B20 for Europe. Japan uses LTE 1, 3, 8 β all supported by the Galaxy S23.
Can I keep my home SIM active while using a Japan eSIM on my Galaxy S23?
Yes. The Galaxy S23 supports 2 active eSIMs simultaneously. You can keep your home SIM active for calls and SMS while your LTE.app Japan eSIM handles data. Set Japan eSIM as your data SIM in Settings.
Is my Galaxy S23 carrier-locked? Will it work in Japan?
Galaxy S23 supports nano-SIM + eSIM. US carrier variants may be locked β check before traveling or buy unlocked. Use Settings β Connections β SIM Manager to add an eSIM, not the regular Connections menu. Samsung's eSIM UI is different from stock Android. To use an eSIM in Japan, your device must be unlocked. Contact your carrier or check Settings β if you can add an eSIM from another provider, it is unlocked.
When should I install the Japan eSIM on my Galaxy S23?
Install it at home over Wi-Fi before your flight. The process takes 2β3 minutes using the QR code from your LTE.app order. Japan requires the eSIM to be installed before arrival in some cases β never wait until you land. Narita International Airport has free Wi-Fi if you forget, but pre-install is strongly recommended.
How many eSIM profiles can I store on my Galaxy S23?
The Galaxy S23 can store up to 10 eSIM profiles, with 2 active at once. You can buy and install eSIMs for multiple countries in advance and switch between them without deleting old ones.
Other devices in Japan
More Japan resources
Ready to use a Galaxy S23 in Japan?
Install your eSIM before your flight. Works the moment you land at Narita International Airport.
Browse Japan Plans