The three real options
| Option | How it works | Best for |
|---|---|---|
| eSIM | Digital SIM installed before you fly, activated on arrival | Most travelers with a newer phone — no physical swap, no airport counter |
| Pocket WiFi ("WiFi egg") | Rent a small hotspot device, pick up/return at the airport | Groups sharing one connection, or older phones without eSIM support |
| International roaming | Use your home carrier's roaming plan | Short trips, minimal setup effort, if your carrier's rates are reasonable |
eSIM — the option most travelers pick now
A growing number of providers sell Korea-specific eSIMs online, activated the moment you land, with no physical SIM card swap and no need to find your home number's SIM to keep it safe. The main requirement is an eSIM-compatible phone, which covers most phones sold in the last several years — worth confirming your specific model before relying on it.
Pocket WiFi
A long-standing option, especially popular with groups splitting one device's cost, or families wanting to avoid setting up individual data plans for kids' devices. Pre-booking for airport pickup is standard and usually cheaper than booking on arrival.
Free WiFi as a backup
Seoul has genuinely widespread free public WiFi — in the subway, at many cafes, and in public spaces — which somewhat reduces the pressure to have constant mobile data, though it's not a substitute for reliable navigation on the move.