Number Format
Area Code: 1-2 digits
Subscriber Number: 6-7 digits
Trunk Prefix: 0
International Prefix: 001
Area code information
2004 - new mobile number ranges
Numerous ranges within +82 10 were introduced for KT wireless service
throughout 2004.
April 2002 - new mobile number ranges
+82 11 1xxx range was introduced for KT mobile service on April 2002.
October 2001 - new mobile number ranges
+82 18 97x and +82 18 98x were introduced for KT mobile numbers
on October 2001.
August 2001 - new mobile number ranges
+82 18 091 and +82 16 160 were introduced for KT mobile numbers
on August 2001.
1 December 2000 - unified message service
Korea Telecom introduced from 1 December 2000 using +82 30 number range.
2 July 2000 - national area code changes
Most 3-digit area codes outside Seoul were changed to new 2-digit codes.
Old codes may still be dialable through 30 January 2001, after which use of
the new codes becomes mandatory.
See Japan carrier KDD (now KDDI) announcements:
announcement with new area codes
and
announcement of 1 June 2000,
indicating corrected permissive period dates.
4 July 1999 - Seoul 8-digit subscriber numbers
On midnight local time, 4 July 1999, 7-digit subscriber numbers that
began with 6xx (from 600-#### through 649-####) were prepended with
the digit '2'. That is, subscriber number 649-#### became 2649-####.
The old 7-digit subscriber numbers were discontinued after
30 September 1999. Attempts to dial the old numbers were greeted with a
recording warning from 1 October 1999 through 31 December 1999.
See
KDD announcement.
1 January 1999 - Seoul subscriber number changes
Certain subscriber numbers in Seoul (+82 2) had the digit '2' prepended
to form 8-digit subscriber numbers. The affected old 7-digit subscriber
numbers began with 2, 638 and 667.
This was a splash cut - that is, the new numbers were immediately mandatory.
However, a recorded message was kept for six months when the old format
was used.
See KDD announcement.
1 July 1998 - personal number service begins
+82 50x number ranges were opened for Personal Number Service, as
of 1 July 1998.
Number range Carrier(s)
============ ==========
+82 502 xxxxxxx DACOM, KT
+82 504 xxxxxxx ONSE only
+82 505 xxxxxxx DACOM, KT
+82 506 xxxxxxx Hanaro Telecom Service (via KT)
Other Information
Also see information from carrier
Korea Telecom.
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