eSIM vs SIM Card vs Pocket Wi-Fi in Korea (2026)

Which option is right for you?

Option	Price (example)	Korean phone number?	Best for
Korean carrier eSIM or SIM	₩18,000 for 3 days of unlimited data (KT)	Yes, with a data-and-voice plan	Visitors who want Korean apps and calls
International eSIM app	About US$12 for 3 days of unlimited data (Airalo)	Usually no	Setting everything up before you fly
Pocket Wi-Fi	From ₩4,400 a day (KT)	No	Groups or families sharing one connection
Free Wi-Fi only	Free	No	Short stays, light use

Korean carrier SIMs and eSIMs

Korea’s three big carriers (SK Telecom, KT and LG U+) sell prepaid plans for foreign visitors. Here’s what KT offered when we checked.

KT data plans

Length	Price
1 day	₩6,500
3 days	₩18,000
5 days	₩27,500
7 days	₩35,000
10 days	₩38,500
30 days	₩71,500

• Speed: unlimited data, slowed to 5 Mbps after 11 GB in a day.
• Data & Voice plans add a Korean 010 number with outgoing calls, for about ₩5,500 more. Incoming calls and texts are free.
• Where to buy:
  • Data-only eSIMs: online.
  • eSIMs with calls and texts: only at KT’s roaming centers at the airport (bring your passport).
  • At Incheon Terminal 1, the counter near Arrival Hall F (opposite Exit 13) is open 24 hours.
• Your phone must be unlocked.

Other options:

• Physical tourist SIM cards are also sold at the airport roaming centers, and at CU, GS25, 7-Eleven and Emart24 convenience stores.
• Airport roaming centers operate at Incheon, Gimpo, Gimhae (Busan) and Jeju airports.

Why a Korean number can matter

Some Korean apps check your phone number by sending a text. For example, Kakao T, the main taxi app, needs a number that can receive a verification text, and foreign numbers often fail. With a Korean data-and-voice plan, those sign-ups work. If you only need taxis, the visitor app k.ride works without a Korean number. See apps you need in Korea.

International eSIM apps

Apps such as Airalo sell Korea eSIMs you can install at home before you fly. You land with data already working.

• Price: Airalo listed unlimited Korea data at about US$12 for 3 days, US$29 for 7 days and US$69 for 30 days.
• Number: these are usually data-only, with no Korean phone number.
• Keep your home SIM: on a dual-SIM phone, your home number can stay active alongside it for calls and texts from home (roaming charges may apply).

Pocket Wi-Fi

A pocket Wi-Fi (“egg”) is a small router you carry around. Several phones and laptops can connect to it at once.

• KT: ₩4,400 a day, unlimited at up to 20 Mbps, for up to 4 devices.
• Deposit: you need your passport and a credit card in your name (not a debit card).
• Where to rent: carrier counters at Incheon and Gimpo airports. Other rental shops quote about ₩5,000–10,000 a day.
• Downsides: one more device to charge and carry, and everyone has to stay near it.

Free Wi-Fi

Free public Wi-Fi is common in Korea:

• Seoul: main streets, parks, markets, bus stops, tourist sites and buses.
  • Connect to SEOUL_Secure (username and password: seoul) for an encrypted connection that reconnects automatically.
  • Or use the open SEOUL network.
• Everywhere else: airports and train and subway stations.

It’s handy, but don’t rely on it for maps and taxis while you’re out.

Before you fly

1. Check your phone is unlocked and whether it supports eSIM.
2. Decide whether you need a Korean number for apps.
3. Install your map, taxi and translation apps on home Wi-Fi.

Budgeting for the trip? The budget calculator includes mobile data.