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Here are couple of options: 1) Pre-order SIM with unlimited data plans (BEFORE GOING TO KOREA) http://www.egsimcard.co.kr/ You have to order this before you arrive to Korea it can be delivered to your accommodation or you can pick it up at the airport. Good for short and long stays. 2) Get SIM / Pocket WiFi at the airport (ALREADY IN KOREA, but at Airport) There are SIM card and pocket Wifi eggs available for rental. This is convenient for short stays under 15 days. 3) Pre-paid SIM in the City - KT Olleh Shop (Left the airport, but in the city) https://global.olleh.com:444/eng/contents/about.do Going to an KT Olleh Global Shop (one near Gangnam Station) will allow you to get a SIM with data plan and a local number. This can be a good option for both short and long stays. Visit a global shop, it will be easier to deal with. You need your passport, and must pay in cash only. ------------------- Pocket WiFi's are nice, but having a SIM is just a lot easier, and you don't have to worry about carrying around another device

Yes, Myeongdong near the Chinese Embassy has very good rates. Other than that your next best bet are banks for conveience, but rates won't be good. Banks in Korea close by 4PM on weekdays.

Myeongdong has the best rate. I suggest you exchange enough money at the airport to get into town. Then go to myeongdong and look for those ... I don’t want to use the word shady but yes those stores that have different currency signs. They only accept $100 bill and has to be new bills

Taxi drivers will usually understand you're a foreigner and lower the expectation for you to speak Korean. If you want to speak Korean for practice or to be polite then you can try to say this simple script: Anh yeong ha say yo - 안영하세요 - Hello Yo Gee - 여기 - Here (show driver the address) Ka ju say yo - 가 주세요 - Can you take me please? Also in Korea, it's best to show a Korean taxi driver the address in the Korean language. PRO TIP: 1) Driver's like big font and text. If you can some copy and paste text into a app to increase font size or screen shot and zoom, it makes things easy. 강남구 대치동 998 (instead of small font like this: 강남구 대치동 998) 강남구 대치동 998 = District - Neighborhood - Land Lot Number 2) If you have the English address and want the Korean version use this website: 998, Daechi-dong, Gangnam-gu, Seoul (English version of above address) http://www.juso.go.kr/openEngPage.do 3) There are two ways to express an address in Korean If you see another version of your address it is not incorrect, it could be one of two versions. Example: 강남구 대치동 998 and 강남구 테헤란로114길 11 are the same place In English: 998, Daechi-dong, Gangnam-gu, Seoul and 11, Teheran-ro 114-gil, Gangnam-gu, Seoul Land Lot Version (Old way, but taxi drivers are used to it) 998, Daechi-dong, Gangnam-gu, Seoul 강남구 대치동 998 Street Address Version (New way) 11, Teheran-ro 114-gil, Gangnam-gu, Seoul 강남구 테헤란로114길 11