Area Code 216 – Istanbul

Overview of +90 216

The country calling code +90 is assigned to Türkiye under the ITU-T E.164 international numbering plan. Within the national numbering plan, the prefix 216 is a geographic area code that designates the Anatolian (Asian) side of Istanbul. This area code is one of two geographic codes serving Istanbul, the other being 212 for the European side. The +90 216 code covers a densely populated and economically significant region, including districts such as Kadıköy, Üsküdar, Maltepe, Pendik, Kartal, and the Princes’ Islands (Adalar).

Dialing Formats and Usage

When dialing a landline number in the Anatolian side of Istanbul from within Türkiye, subscribers must use the national trunk prefix 0 followed by the area code 216 and the 7-digit subscriber number. For example, a local number might be dialed as 0 216 555 12 34. From abroad, callers must dial the international access prefix (e.g., 00 from most countries, or + from mobile phones), followed by the country code 90, the area code 216 (without the leading zero), and the 7-digit subscriber number. Thus, the international format would be +90 216 555 12 34.

Geographic Coverage and Administrative Jurisdiction

The +90 216 area code is administered by the Information and Communication Technologies Authority (BTK) of Türkiye. It serves the entire Anatolian side of Istanbul, which is part of the Istanbul Province. This region is a major business and residential hub, hosting numerous corporate headquarters, financial institutions, and residential areas. The area code is geographically significant because it distinguishes the Asian side from the European side, which uses +90 212. This separation is important for call routing and tariff purposes, as calls between the two sides are considered intercity calls and may incur higher charges.

Overlays and Numbering Considerations

As of the latest BTK regulations, there is no overlay code for the 216 area; the 10-digit national significant number (NSN) format (0 216 XXX XX XX) remains in use. However, due to increasing demand for telecommunication services, the BTK has implemented number portability, allowing subscribers to retain their numbers when changing operators, but geographic numbers are generally tied to the physical location of the line. For callers, it is essential to note that when dialing from a mobile phone within Türkiye, the leading '0' is often optional, but using the full national format is recommended for clarity. International callers should always omit the leading '0' when dialing +90 216.

Practical Guidance for Callers

For local callers within the 216 area, dialing just the 7-digit subscriber number is sufficient for local calls. However, for calls from other regions in Türkiye, dial 0 216 followed by the subscriber number. For international callers, always use +90 216 followed by the 7-digit number. Be aware that some businesses may list their numbers in international format, so always verify the correct dialing sequence. This area code is exclusively for fixed-line services; mobile numbers in Türkiye use separate prefixes starting with 5xx, and are non-geographic.