LG U+
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LG U+ is one of South Korea's three official telecom providers and offers eSIM bundles with unlimited 5G and LTE data. You receive a QR code via email immediately after purchase, allowing you to activate the eSIM without collecting a physical SIM at the airport. This carrier has strong infrastructure in cities and rural areas alike.
Pick LG U+ if you want official-carrier reliability without hunting down a physical sim card booth at Incheon or Gimpo airport. The unlimited data option appeals to streaming and navigation-heavy travelers who don't want to meter their usage.