1) Telephone Service Installation
There are two telecommunication companies, Korea Telecom (http://www.kt.co.kr) and Hanaro Telecom (http://www.hanaro.com).  
You can apply for a telephone at either Korea Telecom or Hanaro by dialing 100 or 106, respectively.
There are no special differences in subscription between the two companies, though Korea Telecom was originally the national phone company and provides services through its network built up throughout the country, while Hanaro serves mostly the larger cities only.
You can make online applications at either company through the internet. Required documents for a new subscription include passport, alien registration certificate and copy of account statement.
In general, a telephone will be installed within a day of application.

Public Phones You can easily find public telephones anywhere in populated or business areas.
There are three types: coin-operated phones, card phones, and credit card (deferred payment) phones. Local calls cost 70 won for three minutes; inter-city calls within Korea are higher but not particularly expensive. Coin phones return the coins that were inserted but not used, but do not return change for partially used 100 won coins. Some coin phones are not public - they are usually encased in hard colored plastic (blue, orange or pink )

2) Telephone Cards
Use telephone cards when making international calls or inter-city calls, because such calls are subtracted from your telephone card billed in 1,000-won increments.
Telephone cards come in 3,000 and 5,000 and 10,000 won denominations; you can buy them in any convenient stores close to telephone boxes or in banks and post offices.
Larger denominations are slightly discounted (i.e. a 10,000 won card for 9,500 won).


3) Credit Card Telephones
You can also make international or local calls using credit cards issued by Korean bank companies or telecommunication companies.
The fare is charged to your credit card.

4) International Calls
There are four international telecom companies in Korea: Korea Telecom (001), Dacom (002), Onse Telecom (008) and Hanaro Telecom (00766).

5) How to Make International Calls
Dial [either 001, 002, 008 or 00766] [country code] [area code] [individual number]

6) To Make International Calls Through Each Country's Telecom Companies
- Japan : 0090-015
- Australia : 0090-61
- Canada : 0090-015
- New Zealand : 0090-64
- United Kingdom : 0090-44

7) Mobile Phones
The mobile phone companies in Korea include SK Telecom (011 cellular), KTF (016 PCS) and LG ( 019, PCS) foreigners who stay in Korea for less than a year usually use prepaid phone because this excludes long-term obligations, credit card hassels, subscription fees and monthly bills.
But you need to buy your own mobile phone and prepaid phone card to be recharged.
For more information, contact a mobile phone shop nearby.

8) Cable TV
Local Cable TV + Internet cable
Seoul  http://www.knctv.co.kr/, http://www.hcn.co.kr/index.hcn, http://www.cnm.co.kr/
Incheon http://www.icntv.co.kr/,  http://www.pcntv.co.kr/
Daejeon/Chungcheong Province http://www.icmb.tv/
Gyeonggi Province http://kyoungki.cnm.co.kr/, http://www.cnm.co.kr/
Daegu http://www.gcs.co.kr/
Gimhae http://www.gytv.co.kr/
Masan http://www.mstv.co.kr/
Busan http://www.hctv.co.kr/, http://www.jbctv.co.kr/  
Gyeongnam Province http://www.knmtv.co.kr/
Jeju http://www.kctvjeju.com/
All of Korea http://www.kcta.or.kr/
HD http://www.skylife.co.kr/index.html