Using a Galaxy S23 in South Korea: eSIM Setup & Internet Guide
π°π· Galaxy S23 works in South Korea
- β Fully compatible with SK Telecom, KT (KT Corporation), LG U+
- 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 South Korea
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 South Korea Plan Works Best for Galaxy S23?
Ask Smart Coach about the best eSIM plans for South Korea, compare carriers, get installation help, and more.
Galaxy S23 compatibility in South Korea
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 South Korea 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 South Korea, go to Settings and switch on your LTE.app eSIM line. Your phone connects to SK Telecom, KT (KT Corporation), LG U+ automatically.
What happens when you land in South Korea
- 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 Incheon 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 SK Telecom, KT (KT Corporation), LG U+
Your Galaxy S23 automatically connects to South Korea's LTE network. South Korea has some of the world's fastest and densest LTE and 5G networks. Seoul, Busan, and Jeju Island have near-perfect coverage. Even rural areas and the KTX (high-speed rail) corridors are thoroughly covered.
- 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 South Korea: cost comparison
Roaming your home carrier in South Korea costs significantly more than a local eSIM.
US carriers charge $10β15/day in South Korea. This can accumulate quickly during a typical Seoul + Busan + Jeju itinerary.
South Korea is unique β tourist SIM cards are sold at CU, GS25, and 7-Eleven convenience stores for KRW 15,000β30,000 (β$11β22) with 10β30 GB. This is exceptionally convenient and cheap. An LTE.app eSIM on SK Telecom or KT is comparable in cost with the advantage of same-day activation before landing.
LTE coverage in South Korea for Galaxy S23 users
South Korea uses LTE bands 1, 3, 5, 7, 28, and 41. KT (formerly Korea Telecom), SK Telecom, and LG U+ all provide excellent nationwide 5G and 4G coverage.
South Korea has some of the world's fastest and densest LTE and 5G networks. Seoul, Busan, and Jeju Island have near-perfect coverage. Even rural areas and the KTX (high-speed rail) corridors are thoroughly covered.
Frequently asked questions β Galaxy S23 in South Korea
Is the Galaxy S23 compatible with South Korea'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. South Korea uses LTE South Korea uses LTE bands 1, 3, 5 β all supported by the Galaxy S23.
Can I keep my home SIM active while using a South Korea 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 South Korea eSIM handles data. Set South Korea eSIM as your data SIM in Settings.
Is my Galaxy S23 carrier-locked? Will it work in South Korea?
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 South Korea, 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 South Korea 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. South Korea requires the eSIM to be installed before arrival in some cases β never wait until you land. Incheon 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 South Korea
More South Korea resources
Ready to use a Galaxy S23 in South Korea?
Install your eSIM before your flight. Works the moment you land at Incheon International Airport.
Browse South Korea Plans