Before You Go
Staying Connected
SIM, eSIM, or pocket WiFi — how to decide, and what to do at the airport.
Why this is the first thing to sort out
Almost everything else in Korea assumes you are online: maps, taxi apps, translation, and paying for things. Airport WiFi will get you as far as the arrivals hall and no further. Decide this before you fly.
The three options
| Option | Best for | Watch out for |
|---|---|---|
| eSIM | Most travellers with a recent phone. Activate before you land; no queue, no physical swap. | Your phone must support eSIM and be carrier-unlocked. Usually data-only — no Korean phone number. |
| Physical SIM | Older phones, or if you want a Korean number for reservations and deliveries. | You keep your home SIM somewhere safe. Collection counter queues can be long. |
| Pocket WiFi | Groups and families sharing one connection, or laptops. | One more thing to charge and to return. Everyone must stay near it. |
Do you need a Korean phone number?
For sightseeing, no — data alone is fine. You need a number if you want to make restaurant reservations, use delivery apps, or verify accounts on some Korean services. Many of those require a local identity check anyway, so a tourist SIM does not always unlock them.
The recommended path
- If your phone supports eSIM: buy one online before you fly and install it while you still have WiFi at home. Turn it on after landing.
- If not: reserve a SIM online for airport pickup rather than walking up. Reserved counters move much faster.
- Traveling as a group with laptops: one pocket WiFi plus an eSIM as backup.
Do not rely on activating anything after landing without a connection. Install and configure while you still have WiFi.
Free WiFi in Korea
Public WiFi is genuinely widespread — subway stations and trains, cafés, and most restaurants. It is good enough as a fallback, but not as a plan: you will need data in exactly the places without it, such as walking to an address or catching a taxi.