data koreaKorean eSim. Pros. Cons. No need to insert any physical SIM card into your phone. Can drain your phone battery the more you use your data. Can easily top up data if you run out. Much cheaper than roaming. Comes with a local phonePopulation, total - Korea, Rep. ( 1 ) United Nations Population Division. World Population Prospects: 2025 Revision; ( 2 ) Statistical databases and publications from national statistical