Using an iPhone 12 in South Korea: eSIM Setup & Internet Guide
π°π· iPhone 12 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 Supports 1 active eSIM 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%.
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iPhone 12 compatibility in South Korea
Network band compatibility
iPhone 12 supports LTE bands 1, 2, 3, 4, 5, 7, 8, 12, 13, 17, 18, 19, 20, 25, 26, 28, 32, 34, 38, 39, 40, 41, 42, 46, 48, 66. B19 support covers Japan NTT Docomo. Broad global coverage across all major regions.
SIM configuration
iPhone 12 has a nano-SIM slot plus one eSIM. One active eSIM at a time. Physical nano-SIM required for voice in dual-SIM mode. Sold in all markets with a physical SIM tray.
Active eSIMs
1
Stored profiles
Up to 5
Physical SIM
Yes
Carrier lock risk
None
How to install your South Korea eSIM on iPhone 12
Complete these steps at home over Wi-Fi before your flight. Takes 2β3 minutes.
- 1
Go to Settings β Cellular β Add eSIM
- 2
Tap "Use QR Code" and scan the QR code from your LTE.app order
- 3
Follow the on-screen prompts to complete eSIM setup
- 4
Label the new plan (e.g., "Travel Data") for easy switching
- 5
Set the new eSIM as your primary data plan when you arrive
- 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 iPhone 12 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 Cellular and enable your LTE.app eSIM line.
- 3
Connect to SK Telecom, KT (KT Corporation), LG U+
Your iPhone 12 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 iPhone 12 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 iPhone 12 in South Korea
Is the iPhone 12 compatible with South Korea's mobile network?
Yes. iPhone 12 supports LTE bands 1, 2, 3, 4, 5, 7, 8, 12, 13, 17, 18, 19, 20, 25, 26, 28, 32, 34, 38, 39, 40, 41, 42, 46, 48, 66. B19 support covers Japan NTT Docomo. Broad global coverage across all major regions. South Korea uses LTE South Korea uses LTE bands 1, 3, 5 β all supported by the iPhone 12.
Can I keep my home SIM active while using a South Korea eSIM on my iPhone 12?
Yes. The iPhone 12 supports nano-SIM + eSIM. Your physical SIM stays active for calls. Set the LTE.app South Korea eSIM as your data line in Settings β Cellular (iOS) or SIM Manager (Android).
When should I install the South Korea eSIM on my iPhone 12?
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 iPhone 12?
The iPhone 12 can store up to 5 eSIM profiles, with 1 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 an iPhone 12 in South Korea?
Install your eSIM before your flight. Works the moment you land at Incheon International Airport.
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