Telephone numbers in South Korea are organized and assigned using the following scheme.
International call out: 00N (where N is the carrier code) followed by the distant country code and telephone number.Calling into Korea: +82 XX XXXX YYYY. The leading "0" is dropped when dialling into South Korea from overseas.Some 1566/1577/1588 telephone numbers cannot be dialed from overseas.Domestic long distance call: 0NN (where NN is the carrier code) followed by the 0XX area code and XXXX YYYY number. See Domestic long-distance service code and Area code.Call to cellular : 01N XXXX YYYY (see Mobile phone number). When phone call is made between unified 010-number subscribers, leading 010 can be dropped (XXXX YYYY).Special service call : 0N0 XXXX YYYY (see Special service)For example;
Call 02-312-3456 within Seoul: 312-3456Call 02-312-3456 from elsewhere: 02-312-3456Call 051-212-3456 within Busan: 212-3456Call 051-212-3456 from elsewhere: 051-212-3456Call 02-312-3456 from abroad: +82-2-312-3456South Korea uses an open dialing plan with a total length (including 0) of 9 to 11 digits and, within city, subscriber numbers 7 to 8 digits long. Dialing from mobile phones to any type of phone except 010 numbers, the area code must be included.
In 1998, telephone numbers in Seoul starting with 2 and 6 added more digit (02-2XX-YYYY to 02-22XX-YYYY, 02-6XX-YYYY to 02-26XX-YYYY). Before area codes were shortened from 4 digit to 2~3 digit in June 2000, there were 1 digit exchange number (usually "2") with some 2 digit exchange numbers so some phone numbers like 0347-61-XXXX, 0443-2-XXXX or 0525-40-XXXX existed. (now 031-761-XXXX, 043-652-XXXX and 055-340-XXXX)
001 - KT international call002 - LG U+ international call003xx - International call over Internet Protocol or international special services00365 - Onse Telecom international call over Internet Protocol005 - SK Broadband international call (Higher quality than the 5 digit prefix service from the same company)006 - SK Telink international call (Higher quality than the 5 digit prefix service from the same company)007xx - International call over Internet Protocol or international special services00700 - SK Telink international call over Internet Protocol00727 - KT international call over Internet Protocol00766 - SK Broadband international call over Internet Protocol00794 - Operator Service008 - Onse Telecom international call (Higher quality than the 5 digit prefix service from the same company)010 - Mobile (All South Korea Mobile Phone Companies, 2G, 3G and 4G from Jan 1, 2004)011 - Mobile (SK Telecom, 2G until Dec 31, 2003)(All South Korea Mobile Phone Companies, 2G from Jan 1, 2004)012 - Machine to machine (Former Beeper)013xx - Mobile special net (wireless vessels etc.)014xx - Point-to-Point Protocol Access number015 - Mobile services: Paging services016 - Mobile (KT, 2G until Jun 30, 2003)(All South Korea Mobile Phone Companies, 2G from Jul 1, 2004)017 - Mobile (SK Telecom, 2G until Dec 31, 2003)(All South Korea Mobile Phone Companies, 2G from Jan 1, 2004)018 - Mobile (KT, 2G until Jun 30, 2003)(All South Korea Mobile Phone Companies, 2G from Jul 1, 2004)019 - Mobile (LG U+, 2G until Dec 31, 2004)(All South Korea Mobile Phone Companies, 2G from Jan 1, 2005)030 - UMS050 - Personal number service060 - Telephone based intelligent service070 - Internet phone (VoIP)080 - Toll-free callBefore June 2000, South Korea used 2 to 4 digit area codes.
02 - Seoul and parts of Gyeonggi-do (Gwacheon, Gwangmyeong and some neighborhoods of Goyang and Hanam)031 - Gyeonggi-do032 - Incheon and parts of Gyeonggi-do (Bucheon and some insular communities of Ansan)033 - Gangwon-do041 - Chungcheongnam-do042 - Daejeon and a part of Chungcheongnam-do (Gyeryong)043 - Chungcheongbuk-do044 - Sejong City049 - Kaesong Industrial Region051 - Busan052 - Ulsan053 - Daegu and a part of Gyeongsangbuk-do (Gyeongsan)054 - Gyeongsangbuk-do055 - Gyeongsangnam-do and a few neighborhoods of Ulsan061 - Jeollanam-do062 - Gwangju063 - Jeollabuk-do064 - Jeju-doIt is not necessary to dial any carrier prefix before making a domestic long-distance call. These prefixes are needed only when you want to choose a different carrier other than your default long-distance carrier (usually the same company that provides your phoneline).
081 - KT082 - LG U+083 - Onse Telecom084 - SK Broadband085xx - [Domestic long-distance Value Added Service (VAS)]086 - SK Telink087 - (Currently not in use)088 - (Currently not in use)100 - KT customer center101 - LG U+ customer center105 - Ship wireless service106 - SK Broadband customer center107 - LG U+ report108 - SK Broadband business customer center109 - KT report111 - NIS112 - Police113 - Spy ReportingArea Code + 114 - Directory assistance(Korea Info Service)115 - KT Telegram116 - KT standard time service117 - School Violence Hotline (from 2012, previously: report sexual trafficking of women)118 - Cyber terrorism report119 - Fire brigade, ambulance120 - Lifestyle service121 - Water utility report122 - Coast guard Emergency telephone number123 - KEPCO Electric report125 - Smuggling report127 - Narcotics report128 - Pollution report129 - Coordination with social welfare service (after October 2005)1300 - Postal services1301 - Prosecutor serviceArea Code + 131 - Weather forecasting132 - Civil Action (Korea Legal Aid Corporation - for contract disputes)1330 - KNTO tourist information (bus·train schedule, hotel·inn information, free translation service)1331 - Human Rights Board1332 - Finance Board1333 - Transport information1335 - Information communication service center1336 - Infringement of personal information board1337 - Military Safety Board1338 - Communications service center and report1339 - Emergency medical treatment134 - Tourist information1345 - Immigration Contact Center (Multilingual support)1350 - Labor Board1355 - National Pension Service1357 - Small and medium enterprise support1365 - Volunteering information1366 - Domestic abuse report1369 - Financial Information Inquiry1377 - Foodbank1379 - Unreasonable infringement of livelihood report1382 - Citizen Registry Confirmation1385 - Business discomfort report and board1388 - Minor mistreatment report1389 - Elderly abuse hotline and board1390 - Election information and infringement hotline1391 - Baby abuse hotline1398 - Child abuse hotline1399 - Unclean grocery report141 - Contact room (KT)182 - Missing child report hotline188 - National Board of Audit and Inspection082-17,1677 - uplus (Dacom) Collect call1541 - KT Collect call1677 - Onse Telecom Collect call1682 - SK Telink Collect call14XXXXXX15XXXXXX1544-XXXX - LG Dacom(LG U+) nationwide single number service1566-XXXX - SK Broadband nationwide single number service1577-XXXX - KT nationwide single number service1588-XXXX - KT nationwide single number service1599-XXXX - SK Telink nationwide single number service16XXXXXX1661-XXXX - LG U+ nationwide single number service1688-XXXX - Onse Telecom nationwide single number service 