Area Code 228 – Bilecik

Overview of Area Code 228 (Bilecik, Türkiye)

Area code 228 is the National Destination Code (NDC) assigned to the province of Bilecik in northwestern Türkiye. It is a geographic area code, meaning that the number is tied to a specific physical location and is used for fixed-line (PSTN) services within that province. The code is part of the Turkish national numbering plan, which follows the ITU-T E.164 recommendation. When dialing internationally, the full number format is +90 228 XXX XX XX, where +90 is the country calling code for Türkiye, 228 is the area code, and the remaining seven digits constitute the subscriber number.

Geographic Coverage and Administrative Jurisdiction

The 228 area code covers the entire province of Bilecik, which is bordered by the provinces of Bursa, Kütahya, Eskişehir, and Sakarya. The administrative center is the city of Bilecik, which is also the provincial capital. Other significant towns within this code include Bozüyük, Osmaneli, Pazaryeri, Söğüt, Gölpazarı, and İnhisar. Bilecik is historically significant as the founding place of the Ottoman Empire and is an emerging industrial hub, with several organized industrial zones. The area code is used for all fixed-line telephones, including residential, business, and government lines, within these boundaries.

Dialing Formats and Instructions

For local callers within Türkiye, the dialing format is 0 228 XXX XX XX. The leading '0' is the trunk prefix used for domestic calls within the country. For example, to call a fixed line in Bilecik from Istanbul, you would dial 0 228 XXX XX XX. For international callers, you must drop the leading '0' and use the country code, resulting in +90 228 XXX XX XX. For instance, to call a number in Bilecik from the United States, you would dial +90 228 XXX XX XX. It is important to note that there is no overlay code for this area; 228 is the sole area code for the province. Therefore, local calls within Bilecik do not require an area code if dialed from a landline within the same province, but it is always safe to include the area code for clarity, especially when using mobile phones.

Caller Instructions and Number Portability

When calling from a mobile phone within Türkiye, it is standard practice to dial the full national number, including the trunk prefix and area code, even if you are in the same area. This ensures proper routing. For international callers, it is essential to use the plus sign (+) or the international access prefix of your country (e.g., 011 in the US, 00 in most European countries) followed by the country code, area code, and subscriber number. As of 2024, Türkiye has implemented mobile number portability, but fixed-line numbers are generally tied to the geographic location. However, number portability for fixed lines is also available within the same area code, meaning that a subscriber may retain their number even if they change service providers, but the number remains associated with the Bilecik area. This is important for businesses that rely on a local presence.