- Get your KT Olleh 4G SIM card right at the major airports and at Busan Harbor in South Korea - Enjoy unlimited 4G LTE speeds so you stay connected with the people that matter! - Free for incoming voice calls and incoming text messages - Choose different packages for trips of varying lengths with 1, 5, 10 and 30 day options - Enjoy a minimum of 5 days with 120 hours of validity!