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i highly recommend neokosim. The internet is so fast and i didnt have any problems.
Half way through my trip and no problems at all. Used all throughout Seoul and outlying areas like asan. Used on the KTX from Seoul to Busan. I have never once had no service. Am very happy and will be using this service every time I am here in Korea.
This is perfect, great LTE, never let me down, that's why I use always whenever I visit Korea.