Area Code 312 – Uzhgorod/Chop, Zakarpattia

Geographic Coverage and Administrative Jurisdiction

The +380 312 area code is a geographic National Destination Code (NDC) assigned to the western Ukrainian region of Zakarpattia (Transcarpathia). Specifically, it serves the city of Uzhhorod (Uzhgorod), the administrative center of Zakarpattia Oblast, and the adjacent town of Chop, a key railway border crossing with Hungary and Slovakia. The code covers a compact but strategically important area near the country's western borders, facilitating communication for local government, businesses, and cross-border logistics operations.

Dialing Formats and Number Structure

Within Ukraine, calls to numbers in the 312 code require trunk prefix '0' followed by the area code and the subscriber number. The national format is 0 312 XX XX XX, where the subscriber number consists of six digits. For international callers, the country code +380 is used, and the leading '0' is dropped, resulting in the format +380 312 XX XX XX. This structure aligns with ITU-T E.164 recommendations, ensuring unambiguous routing across PSTN and VoIP networks.

Local and International Caller Instructions

Local callers within Uzhhorod or Chop must still dial the full national number (0 312 ...) as there is no local-only dialing. Callers from other Ukrainian cities use the same national format. For foreign callers, the international access code of their country (e.g., 00 from most European countries, 011 from North America) is followed by 380 and then the area code without the trunk prefix. For example, to reach a Uzhhorod number 312 45 67 89 from the United States, one would dial 011 380 312 45 67 89.

Overlay and Numbering Considerations

Currently, the 312 code does not have an overlay, meaning it is the sole geographic code for Uzhhorod and Chop. However, due to the increasing demand for telecommunication services, the Ukrainian regulator (NCCIR) has implemented number portability, allowing subscribers to retain their numbers when switching operators, including within this geographic area. This does not affect the geographic significance of the code but ensures competitive service delivery.

PSTN and VoIP Integration

While traditionally associated with fixed-line PSTN services, the 312 code is also used by VoIP providers that offer local numbers to businesses and residents. Callers cannot distinguish between PSTN and VoIP lines based solely on the number, as routing is handled transparently by the network. This integration supports modern communication needs while maintaining the geographic identity of the code.

Practical Examples

• Local call (within Ukraine): 0 312 45 67 89
• International call (from abroad): +380 312 45 67 89
• Example with full international prefix (from UK): 00 380 312 45 67 89