Area Code 2797 – Shibukawa, Gunma

Overview of Area Code 2797

Area code 2797 is a geographic National Destination Code (NDC) assigned to the city of Shibukawa and its surrounding areas within Gunma Prefecture, Japan. It is part of the Japanese telephone numbering plan administered by the Ministry of Internal Affairs and Communications (MIC) and operated under the ITU-T E.164 standard. The code is used for fixed-line (PSTN) services, including traditional analog lines, ISDN, and NTT's optical IP telephony services (e.g., FLET'S Hikari).

Geographic Coverage and Administrative Jurisdiction

Shibukawa is a city located in the central-western part of Gunma Prefecture, in the Kantō region of Honshu. The area code 2797 covers not only the city center but also the former towns and villages that merged into Shibukawa, such as Akagi, Kitatachibana, and others. The region is known for its hot springs, the famous Shibukawa Sky Terrace, and its proximity to Mount Haruna. The administrative jurisdiction falls under the Gunma Prefectural Government, with local numbering administered by NTT East (Nippon Telegraph and Telephone East).

Dialing Formats and Instructions

For local callers within the same area code (2797), the local number is typically 7 digits, and the full national number is 10 digits (excluding the trunk prefix 0). The international format for calling a Shibukawa number from abroad is +81 2797 XXXX XXX (where X represents the subscriber number). For example, a local number 123-4567 would be dialed as 012-345-6789 within Japan, and as +81 2797 123-4567 from overseas. Note that the leading '0' is dropped when using the international prefix.

When dialing from a mobile phone or from outside the area code, callers must include the trunk prefix '0' followed by the area code and subscriber number. For instance, from Tokyo, one would dial 0279 7X XXXX (where X is the subscriber number). It is important to note that the area code 2797 is not an overlay; it is a standalone code, and local calls within the same code do not require the area code when dialing between fixed lines in the same area.

Caller Instructions for Local and Foreign Callers

For local callers within Shibukawa, simply dial the 7-digit subscriber number. For callers from other parts of Japan, dial 0-2797-XXXXXXX. For international callers, dial your country's exit code (e.g., 011 from the US, 00 from most European countries), then Japan's country code 81, followed by the area code without the leading zero (2797) and the subscriber number. For example, to call a Shibukawa number from the United States, you would dial 011 81 2797 1234567.

Technical Considerations

As with all Japanese geographic area codes, number portability is available for fixed-line services, allowing users to retain their numbers when switching carriers. The area code 2797 is expected to remain in use for the foreseeable future, with no planned changes to the numbering structure. For VoIP services, the same dialing rules apply, but users should ensure their service provider supports geographic number routing.