Area Code 368 – Sinop

Geographic Overview

The country calling code +90 is assigned to Türkiye under the ITU-T E.164 international numbering plan. The national destination code (NDC) 368 is a geographic area code allocated to the province of Sinop, located on the northern coast of Turkey along the Black Sea. Sinop is known for its historic peninsula and natural harbors, and the code covers the entire provincial administrative area, including the central district of Sinop and its connected towns and villages.

Coverage and Administration

The 368 area code is administered by the Information and Communication Technologies Authority (BTK) of Turkey. It serves all fixed-line telephone subscribers within the provincial borders of Sinop. Key localities that fall under this code include the city center of Sinop, as well as districts such as Ayancık, Boyabat, Dikmen, Durağan, Erfelek, Gerze, Saraydüzü, and Türkeli. The code is exclusively for PSTN (Public Switched Telephone Network) and VoIP fixed-line services; mobile numbers in the region use separate non-geographic prefixes.

Dialing Formats

For local callers within Turkey, the number is dialed in the national format: 0 368 XXX XX XX. The leading '0' is the trunk prefix used to access the national network. For example, to call a fixed line in Sinop from Istanbul, you would dial 0 368 123 45 67.

For international callers, the format is +90 368 XXX XX XX, omitting the trunk prefix. For instance, a caller from the United States would dial +90 368 123 45 67. The plus sign represents the international access code, which varies by country (e.g., 011 from the US, 00 from most European countries).

Number Structure and Overlays

All fixed-line numbers in Sinop consist of 7 digits after the area code, making the total national significant number (NSN) length 10 digits when including the area code (excluding the trunk prefix). There are no overlay codes currently in effect for Sinop; the 368 code is the sole geographic code for the province. However, as part of Turkey's ongoing numbering plan updates, subscribers may be able to retain their numbers when switching between fixed-line operators, a practice known as local number portability.

Caller Instructions

When calling from abroad, always replace the international access code with the '+' sign when possible to ensure proper routing. For calls from mobile phones, the same international format applies. If you are within Sinop and calling another local number, you may need to include the area code even for local calls, depending on the current dialing procedures. Always check with your service provider for the most up-to-date dialing instructions.