Which global eSIM actually works in Korea? I spent two weeks digging through official pricing pages, Reddit complaint threads, and published traveler reviews to cut through the marketing noise. Here's the reality most affiliate blogs won't tell you. Quick Reality Check: What works: All six brands activate on Korean networks and give you data on arrival at Incheon. What doesn't: "Unlimited" doesn't actually mean unlimited, and network assignment isn't always what the marketing implies. Surprise finding: Airalo's Korea plans run on SK Telecom or LG U+ (not KT, as many old blog posts claim), and the network can vary by plan.