Getting Online in Korea: eSIM, SIM, or Pocket Wi-Fi

There's one decision worth making before you fly: how you'll get online in Korea. Leave it until you land and you'll queue at the airport. Leave it entirely and you'll be standing at a bus stop with a map that won't load.

First — the mistakes people make

• Assuming a trip needs a Korean phone number. For most things, data is all you need, and an eSIM or SIM covers that. (If you do want a number, there's a way — below.)
• Queuing at an airport SIM counter after you land. Install an eSIM before you leave and you're connected the moment you switch your phone on at the gate. No wait.
• Installing the standard Kakao T app and getting stuck at verification. The standard version wants a Korean number. There's a workaround below.
• Relying on the free airport Wi-Fi. It doesn't leave the airport with you.

Option 1 — an eSIM (this is the right call for most people)

• Who it's for: Anyone on a phone from the last few years. Roughly iPhone XS or later, Galaxy S20 or later, supports eSIM — but check your specific model, since some region variants leave it out.
• How it works: Buy and install it before you fly, from an app or a website. It activates automatically when you land and power on. Nothing to swap, nothing to lose.
• Cost (as of 2026, and it moves around): Depending on provider and data, roughly US$10–17 for 7 days and 5GB, around $40 for 30 days unlimited. Airalo, Nomad, Holafly, Saily and others.
• Note: Tourist eSIMs are mostly data only — no Korean number.

Option 2 — a local SIM card

• Who it's for: Anyone on an older phone that doesn't do eSIM, anyone who'd rather hold a physical card, and anyone who wants a Korean number.
• How it works: SK Telecom, KT and LG U+ all have counters in the Incheon Airport arrivals halls (both terminals, generally open morning to night); convenience stores (GS25, CU, 7-Eleven) sell them too. Reserve online first and you just collect it at the desk, skipping most of the line.
• Cost: Around ₩15,000–30,000 for 7–30 days of unlimited data.
• A Korean number: Data-only SIMs don't come with one, but if you buy a tourist SIM that includes calls and texts and top up call credit at the pickup booth, you get a temporary 010 number for the length of your trip. It's temporary — you can't port it to another plan later — and a permanent Korean number still needs a residence card and a long-stay visa.
• Note: Keep your home SIM somewhere safe.

Option 3 — a pocket Wi-Fi router

• Who it's for: A group travelling together and staying together. One device, several phones.
• How it works: Rent it at an airport counter or online, return it the same way.
• Note: You carry it and charge it, and the moment your group splits up it's useless to whoever doesn't have it. With eSIMs now standard, it's a less compelling option than it used to be.

Do you need a Korean number?

For most things, no. Data is enough:

• Maps and directions: Which app to open for what — Naver Map, KakaoMap and Google Maps all work on data.
• KakaoTalk: If you're already registered on your home number, it keeps working. No new number needed.
• Taxis: The standard Kakao T app wants Korean-number verification. Use k.ride instead — Kakao Mobility's app for foreigners, which you sign into with a Google or Apple account and pay with an overseas card. UT (Uber) and Taba are alternatives.
• If you genuinely need a number — some reservation kiosks, some delivery apps — a tourist SIM with calls and texts comes with a temporary 010 number. An eSIM won't.

What this means if you're visiting

• Recent phone: eSIM. Set it up before you fly and you're connected on arrival with nothing to do at the airport.
• Older phone, or you want a Korean number: airport SIM. Reserve it online, collect at the desk.
• Travelling as a group: consider pocket Wi-Fi — but only if you stay together.
• Taxis aren't the problem. Swap Kakao T for k.ride and you don't need a number for it.

Soo's Tip

Sort the eSIM out at home the night before you fly, while you're on your own Wi-Fi and not tired — installing it is a two-minute job there and an annoying one in an airport with a weak signal. Turn data roaming on for the eSIM line and leave your home line on Wi-Fi only, so you don't come back to a roaming bill.