eSIM vs carrier roaming: which is cheaper?
In short, for a short trip or light data use, a travel eSIM is usually cheaper, because you buy only the countries and data you need. Carrier roaming costs about ₩11,000–₩15,000 a day. But if you want to use it straight away with no setup, or you use a lot of data, compare carrier unlimited roaming too.
Carrier roaming prices at a glance
| Service | Details | Price |
|---|---|---|
| SKT baro (T roaming) 1-day pass | Zone 1, slow speed after 300 MB | ₩11,000 a day |
| KT All-day Roaming Basic | Unlimited at 400 Kbps after 500 MB | ₩11,000 a day |
| KT All-day Roaming Premium | Unlimited data (400 Kbps after 5 GB a day) + calls | ₩15,000 a day |
| LG U+ Daily Data Roaming | Unlimited at 200 Kbps after 300 MB | ₩11,000 a day |
| Yeohaengyusim eSIM | Buy only the countries and data you need | From ₩1,492 |
※ Prices are examples based on each carrier’s published information in 2026. Check the latest terms on each carrier’s official page.
When an eSIM is better
For a short trip for one or two people, or when you want to fix the data you need in advance, an eSIM is better. The price is set in advance so there are no unexpected bills, and you can compare prices and networks country by country to choose the plan that fits.
When carrier roaming is easier
If you want to use it as soon as you switch on with no setup, use so much data that you need unlimited, or make many short business trips, carrier unlimited roaming can be easier. Multiply about ₩11,000–₩15,000 a day by the number of days and compare it with an eSIM.
How to avoid roaming charges with an eSIM
Install the eSIM before you leave, turn off data roaming on your Korean SIM, then set the eSIM as your data line. Keep your Korean number for calls and texts as usual; data is only used at the fixed price, so you avoid a huge bill.