Area Code 212 – Istanbul

Overview of +90 212

The country calling code +90 is assigned to Türkiye under the ITU-T E.164 international numbering plan. Within this national plan, the prefix 212 is a geographic National Destination Code (NDC) that identifies the European side of Istanbul, one of the country's largest metropolitan areas. This area code is used for fixed-line (PSTN) and fixed-wireless telephone services, as well as for Voice over IP (VoIP) lines that are registered to addresses within the European side of the Bosphorus. The Asian side of Istanbul uses the separate area code 216, while other Turkish provinces have their own distinct NDCs.

Geographic Coverage and Administrative Jurisdiction

The 212 area code covers the European landmass of Istanbul Province, encompassing major districts such as Fatih (the historic peninsula), Beyoğlu, Beşiktaş, Şişli, Bakırköy, and Sarıyer. This region is the commercial and historical heart of the city, hosting the headquarters of numerous national and international companies, government institutions, and cultural landmarks. The NDC is administered by the Information and Communication Technologies Authority (BTK) of Türkiye, which oversees the allocation of numbering resources to licensed operators.

Dialing Formats and Caller Instructions

For international callers, the complete number must be dialed in the format +90 212 XXX XX XX, where +90 is the country code, 212 is the area code, and the remaining seven digits represent the subscriber number. When calling from within Türkiye but outside the 212 area, users must dial 0 212 XXX XX XX, using the national trunk prefix 0. Local calls within the European side of Istanbul can be made using the seven-digit subscriber number alone, without the area code, in most cases. However, due to the introduction of overlay numbering plans and the increasing use of mobile and VoIP services, it is advisable to always use the full national format (0 212 ...) when dialing from any other Turkish network to ensure proper routing.

Numbering and Overlay Considerations

Istanbul's European side was one of the first regions in Türkiye to face numbering exhaustion. To address this, the BTK introduced an overlay code, 212, alongside the existing 216 for the Asian side, but within the European side, the 212 code remains the sole geographic code. As of recent years, no additional overlay has been implemented for the European side, but subscribers may be assigned numbers with the 212 prefix regardless of their physical location within the European side, including new developments. For callers, this means that the area code is an essential part of the number and must always be included when dialing from outside the local area or from mobile phones.

Practical Examples

• International call to a fixed line in Istanbul (Europe): +90 212 555 12 34
• Domestic call from Ankara to Istanbul (Europe): 0 212 555 12 34
• Local call within Istanbul (Europe): 555 12 34 (if supported by the operator)

When dialing from a mobile phone in Türkiye, it is standard practice to include the leading 0 and the area code, even for local numbers, to avoid misrouting. For international callers, the plus sign (+) is used to denote the international access code, and the leading zero of the national trunk prefix is omitted.