Area Code 1398 – Kumaishi, Hokkaido

Overview of Area Code 1398

Area code 1398 is a geographic National Destination Code (NDC) assigned to the town of Kumaishi in the Hokkaido region of Japan. This code is part of the Japanese numbering plan under ITU-T E.164, and it is used for fixed-line (PSTN) services within the Kumaishi exchange area. The region is served by the local telecommunications carrier, and the code is administered by the Ministry of Internal Affairs and Communications (MIC).

Geographic Coverage and Dialing Formats

The 1398 area code covers the town of Kumaishi and its surrounding administrative areas within Hokkaido. Kumaishi is a small coastal town known for its fishing industry and scenic landscapes. When dialing a local number within the same area code, callers can omit the area code and dial only the subscriber number. However, for calls from outside the 1398 area (but still within Japan), the full national format must be used: 0-1398-XXXXXX (where X represents the subscriber number). For international callers, the format is +81-1398-XXXXXX.

Calling Instructions

• Local calls (within Kumaishi): Dial the 6-digit subscriber number directly (e.g., 123456).
• National calls (from other parts of Japan): Dial 0-1398-123456.
• International calls (from abroad): Dial your country's exit code, then 81-1398-123456 (e.g., from the US/Canada: 011-81-1398-123456).

Numbering and Overlay Considerations

Japanese geographic area codes are assigned based on the pre-existing telephone exchange boundaries. The 1398 code is a relatively small NDC, serving a limited population. As of the latest numbering plan updates, there are no overlay codes or 10-digit dialing requirements for this area. The subscriber numbers are typically 6 digits long, making the total national number 10 digits (including the leading '0'). It is important to note that when dialing from a mobile phone, the same national format applies, and callers should always include the area code unless they are within the same geographic area.

Service Providers and Usage

Fixed-line services in the 1398 area are primarily provided by NTT East (Nippon Telegraph and Telephone East), which is the incumbent local exchange carrier. Alternative carriers may also offer services via interconnection, but the geographic code remains tied to the physical location. VoIP services may also be assigned numbers with this code, but they are subject to location-based routing regulations. For businesses and residents in Kumaishi, the area code is an essential part of their contact information, and it is crucial for callers to use the correct prefix to ensure successful connection.