Taxi drivers in South Korea won't expect you to tip them, even when they help you with your luggage. As tipping taxi drivers in South Korea is not customary, trying to pay more than your agreed fare may cause confusion and embarrassment.
At least the SIM cards for foreigners that you can expensively buy in the airport work. But you won't be able to pay by credit card via the app. Only option for non Koreans is pay to the taxi driver...
Seoul Taxi TipsAll taxis in Seoul accept credit, debit and cash payments, as well as Tmoney cards. Food, drink and smoking are prohibited during your taxi transfer.
Well we would like to recommend the must-have application used by everyone in Korea: Kakao Taxi. This app supports English and it got an intuitive interface. You don't have to speak a single word to the taxi driver about where you wish to go and spending time to understand each other.
Kakao is not just the name of the mobile messenger that almost all South Koreans use. It is a Korean substitute for the US’ Uber or Southeast Asia’s Grab. KakaoT, operated by the messenger app company, is by far the most widely used app to hail a taxi, although there are smaller competitors.
General TaxiThe general taxis are the cheapest and the most commonly found taxis. Most of the times, the general taxi drivers only speak Korean. If you are traveling metropolitan area, the drivers may know how to say simple English phrases. You might encounter some problem with communication.