+90 392

Country Code: +90 392 / 533 / 542
International Call Prefix: 00
Trunk Prefix: 0

In the Turkish Republic of Northern Cyprus (TRNC), the Turkish numbering plan is in use. Hence the international country code for Northern Cyprus is also +90. 392 is the area code of all landlines. Mobile Operators, Kuzey Kibris Turkcell and KKTC Telsim use 533 and 542 area codes respectively.

For calls from the Republic of Cyprus to Northern Cyprus, the code 0139 followed by the 7-digit subscriber number is used, which are charged at local call rates. 0139 is still used for direct calls to Northern Cyprus even after the numbering plan change of December 2001.

For calls from Northern Cyprus to the Republic of Cyprus, area code 0123 is used but the call is charged at international rates. It is also possible to use the international prefix 00357.

These direct telephone connections between Cyprus and Northern Cyprus are operated by the United Nations exchange, which allows direct telephone calls between the two communities is in place since 4 May 1998.

After March 2, 2003 direct international calls from Northern Cyprus to Turkey are possible and now callers from Cyprus can call Northern Cyprus through Turkey dialling 0090 392 xxxxxxx as well as using 0139 (although in this case calls will be charged at international rates).

...
Wikipedia