Download one of the Korea subway Apps
Download one of the subway mobile app on your phone, it would be help you to finding directions and travel to destination in convenience. Keep in mind that you can find free WiFi in all the metro/train stations and inner train, and in front of the mobile phone stores and convenience stores in the streets as well. In case of visit restaurant for meal, politely ask WiFi password then most restaurants will provide WiFi password.
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Comprehensive Korean public transit information