Phone calls
Most of Koreans carry cellular phones these days, eliminating the need for public telephone booths. Though number of public telephone booths are decreaced, they still exist on streets where there are many pedestrians, near bus stops, inside subway stations, and in most public transportation facilities. Public telephones in Korea not only provide domestic call services, but services for international calls as well.
There are two main types Korea¡¯s public telephones: One of them accepts coins and the other one accepts only cards. The public coin telephone booths can generally take both credit cards and coins. Telephone cards can usually be purchased at convenience stands or stores near the telephone booths, and cannot be exchanged for cash. The cards are valid for a period of three years and can be purchased at 3000, 5000, or 10,000 won denominations. The cards can also be kept as a souvenir, as many cards are printed with a variety of popular Korean tourist sights and beautiful scenery.
* Tip: Coin phones return coins that are not charged, but don't return change for partially used 100 won coins.

International Calls
How to call Korea from overseas
When you make a phone call to Korea from abroad, first dial 82 (Country Code for Korea), then Area Code (except for the first number 0), at the last, dial the Phone Number you want to call.
For example: Calling Seoul (Area Code 02) with 777-7777 as the phone number, dial +82-2-777-7777.
How to call overseas from Korea
First dial any of the following international call company numbers( 001, 002, 008, 00345, 00365, 00388, 00700, 00727, .... )and then the country code, area code and finally the number you are calling.

Internet
Internet service is available in public places such as airports, train stations, and bus terminals in Korea. And you can see many PC rooms and internet cafes to get internet service and easy to find throughout the country. Many PC rooms are open 24 hours and some have snack bars with beverages, noodles, and other snacks available.

Mobile Phones
SK Telecom, LG Telecom, and KTF, which are mobile phone companies in Korea, provides mobile phone roaming and rental services at Incheon Airport. (Open 24 hours a day)
* SK Telecom
Location: Between exits 6 and 7 on the 1st floor, and between check-in counters E and F on the 3rd floor
Phone No.: 82-32-743-4037,4052

* KTF, LG Telecom
Location: Between exits 10 and 11 on the 1st floor, and between check-in counters G and H on the 3rd floor
Phone No.: LG Telecom (82-32-743-4019), KTF(1588-0608)