Korea uses European-style plugs.
Country code: 82
Calling U.S. from Korea: 011-1-number
Korea has both CDMA and GSM.
Verizon website verifies that South Korea is a CDMA country for which the international roaming rate is $1.99/minute. Texts are $0.50 to send, $0.05 to receive.
Unlimited data plans cost $64.99/month. (They call it Global Email, but it works for all data.) They'll pro-rate half a month for you. To update roaming capabilities on your phone, dial *228 option 2.
For international support, call:
- 800-711-8300 (in U.S.)
- 908-559-4899 (abroad)
May 2009 CNET article on traveling abroad with your cell phone.
Possibly useful sites:
Google Maps does not provide driving or walking directions in South Korea (the only country in the world it doesn't do this, including North Korea!), because of government restrictions on geo data. Use Kakao Map or Naver Map instead.