Area Code 457 – Nova Zagora

Geographic Overview

The +359 457 country and area code combination serves the fixed-line telephone network of Nova Zagora, a town situated in the Sliven Province of central Bulgaria. This geographic prefix is allocated under the Bulgarian national numbering plan, which adheres to the ITU-T E.164 standard. The area code 457 is used for traditional PSTN (Public Switched Telephone Network) services and is also carried over VoIP (Voice over Internet Protocol) infrastructure, though the number remains associated with the geographic region.

Coverage and Administrative Jurisdiction

Nova Zagora is the administrative center of the Nova Zagora Municipality. The 457 area code covers the urban area of the town and its surrounding villages within the municipality. Key localities that may be reached via this code include the town itself and nearby settlements such as Korten, Banya, and Orizari. The region is part of the Upper Thracian Plain, and its economy is primarily agricultural, with some light industry.

Dialing Formats

For callers within Bulgaria, the national trunk prefix is 0. To call a Nova Zagora number from another Bulgarian city or mobile phone, you must dial: 0 457 XXX XXX (where X represents the local subscriber number). For example, a local number might be 5 12 34, so the national dialing format would be 0 457 5 12 34.

For international callers, the Bulgarian country code is +359. The leading zero of the national prefix is omitted. Thus, to call the same number from abroad, you would dial: +359 457 5 12 34. This format is consistent with the E.164 international numbering standard.

Local Dialing and Overlay Considerations

Within the Nova Zagora area, if you are calling another fixed-line number in the same area code, you may be able to dial just the local subscriber number (without the area code) depending on the specific local dialing rules. However, for clarity and to avoid misdialing, it is recommended to always use the full national format when dialing from a different area or from a mobile network.

Currently, there is no overlay code for the 457 area. The numbering plan is not overlaid, meaning that the area code is unique to the Nova Zagora region. However, number portability allows subscribers to retain their numbers when switching service providers, but the geographic significance of the code remains.

Caller Instructions

For local callers within Nova Zagora, if you are dialing from a landline in the same area code, you may dial the subscriber number directly. For callers from other parts of Bulgaria, always use the national trunk prefix 0 followed by the area code 457 and the subscriber number. For international callers, use the +359 country code, then the area code 457 (without the leading zero), followed by the subscriber number.