Area Code 328 – Osmaniye

Overview of Area Code 328 (Osmaniye, Türkiye)

Area code 328 is a geographic National Destination Code (NDC) assigned to the province of Osmaniye in southern Türkiye, within the Çukurova sub-region. It is part of the Turkish numbering plan administered by the Information and Communication Technologies Authority (BTK) under the framework of ITU-T E.164. The code serves the entire Osmaniye Province, including its central district and the surrounding towns and villages. Key localities covered by this code include Osmaniye city center, Kadirli, Düziçi, Bahçe, Sumbas, and Toprakkale.

Dialing Formats and Usage

When calling a fixed-line subscriber in Osmaniye from within Türkiye, you must dial the trunk prefix 0, followed by the area code 328 and the 7-digit subscriber number. The national significant number (NSN) is 10 digits in total (0 + 328 + 7 digits). For example, to reach a landline in Osmaniye with the subscriber number 123 45 67, you would dial: 0 328 123 45 67.

For international callers, the format changes: you must dial your country's international exit code (e.g., 00 from most European countries, 011 from the United States), followed by Türkiye's country code 90, then the area code 328 (without the leading zero) and the 7-digit subscriber number. Thus, the same number would be dialed as: +90 328 123 45 67.

Geographic Significance

Osmaniye is strategically located near the Gulf of İskenderun and is an important agricultural and industrial hub. The area code 328 is exclusively used for fixed-line (PSTN) services; mobile numbers in Türkiye use separate non-geographic codes (e.g., 501, 505, 530). As with most Turkish geographic codes, there is no overlay or additional area code for Osmaniye; the 328 code is unique to this province. Callers from other provinces must always include the trunk prefix and area code, even for local calls placed from within Osmaniye, because Türkiye uses an open dialing plan with mandatory area code for all calls.

Regulatory and Technical Notes

The Turkish numbering plan is regulated by BTK, and number portability allows subscribers to retain their geographic numbers when moving to a different operator, but the area code remains tied to the original geographic location. VoIP services may also use geographic numbers, but the physical location of the caller is irrelevant for routing. For accurate billing and emergency services, it is essential to dial the correct area code.