Korea eSIM or SIM card: it depends on whether you need a number

There are about ten English pages competing for “best eSIM for Korea” and they all do the same thing. They rank providers by download speed and price per gigabyte. Some of them are careful and well researched.

They are also answering a question that comes second. The first one is whether you need a Korean phone number, because that decision quietly rules half the options in or out, and almost nobody leads with it.

What a Korean number actually unlocks

Korea runs a lot of ordinary life through phone-number identity verification. Not two-factor codes as a security extra. Verification as the way you prove you are a person at all, on a 010 number.

Without one, this is roughly where you land:

Foreign numbers do not reliably receive these verification texts, so keeping your home SIM in the other slot does not rescue you.

Whether that matters is genuinely personal. Plenty of people spend a week here on maps and messaging alone and never miss it. But if your plan involves getting a taxi at 1am without speaking Korean to a driver, or eating in your hotel room, the number stops being optional.

The three options

The eSIM providers everyone compares are mostly in the first row. That is why they are cheap, and it is also why the comparison articles rarely mention what you are giving up: the products being compared all have the same limitation, so it drops out of the comparison entirely.

Some prepaid eSIM products do include voice and SMS with a Korean number. They are less common and need identity checks, usually at an airport roaming counter with your passport rather than by tapping a QR code on the plane.

Buying a prepaid SIM

You need your passport. Residents use a residence card, but as a visitor the passport is what the counter will ask for, and a copy may be taken.

Cost starts around 13,800 won, which is roughly 8,800 for the SIM plus a 5,000 won minimum top-up. Cash and cards are both fine.

New in July 2026: they will scan your face

This one is recent enough that no guide has caught up with it. Since July 2026, activating a Korean mobile line includes a face verification step. The scan is checked against the photo on your ID.

It came in to stop the burner phones used in phone scams, which have been a serious problem here. The check runs under privacy rules that require the scan to be deleted straight after activation.

Two practical notes. There is a three month trial period, during which a failed scan is processed as an exception rather than a refusal, so a bad camera angle is not going to strand you. And it is being rolled out through the three big carriers first.

If you are reading an English guide that says a passport is all you need, that guide was written before July.

What I would actually do

For a trip under a week where you are sightseeing, eating at places you walk into, and taking the subway: a data-only eSIM. Set it up before you fly, connect the moment the plane door opens, done. It is cheaper and there is nothing to collect.

For anything longer, or if you already know you want delivery and app taxis: get a prepaid SIM with a number at the airport. Yes it costs more and yes you have to stand at a counter. It also stops the daily papercuts where an app asks for a number you do not have.

If you land after the counters shut, an eSIM you bought before flying is the one that still works at 1am. That is also the hour when the last airport train has already gone, which is worth checking against your arrival time in Incheon Airport to Seoul.

What is not checked here yet

I have verified the number-verification rules and the July face-scan requirement against government sources. I have not yet gone through current prepaid plan pricing carrier by carrier, or checked the airport counter opening hours for a late arrival. Those get their own page with their own date.

If something here has moved, tell me and I will fix it.