Area Code 2787 – Numata, Gunma

Overview of Area Code 2787

Area code 2787 is a geographic National Destination Code (NDC) within the Japanese numbering plan, assigned to the city of Numata in Gunma Prefecture. Located in the northern Kanto region of Honshu, Numata serves as a local administrative and commercial hub. The code covers Numata City and its surrounding areas, including parts of the Tone District. As with all Japanese geographic codes, 2787 is used for fixed-line (PSTN) services, and calls to this area are routed over the public switched telephone network.

Dialing Formats

When dialing a Numata number from within Japan, you must include the trunk prefix 0 before the area code. The full national format is 0-2787-XX-XXXX, where the subscriber number typically consists of 6 digits. For example, a local number might be 02787-12-3456. From overseas, callers must use Japan's country code +81, drop the leading 0, and dial +81-2787-XX-XXXX. Thus, the same number would be dialed as +81 2787 12 3456.

Geographic Coverage and Administration

The 2787 area code is administered under Japan's Ministry of Internal Affairs and Communications (MIC) and is allocated to NTT East, the regional incumbent carrier. The service area includes Numata's central business district, residential neighborhoods, and nearby rural communities. Notable locations within the code include the Numata Castle ruins, the Kawaba Ski Resort, and the scenic Tanigawa Mountains. The code is not overlaid with another NDC, meaning that local calls within the 2787 area can be made using the 6-digit subscriber number alone, without the area code.

Caller Instructions

For callers within Numata, local calls require only the 6-digit number. For callers elsewhere in Japan, dial 02787 followed by the subscriber number. International callers should use +81 2787 followed by the number. As with all Japanese geographic numbers, calls to 2787 are tariffed as domestic fixed-line calls, and rates may vary depending on the carrier and time of day. VoIP services often include these numbers in their calling plans, but users should verify coverage with their provider.

Important Notes

Since Japan implemented number portability for fixed-line services, customers in Numata may retain their 2787 numbers when switching between eligible carriers. However, the geographic significance of the code remains tied to the physical location of the line. When dialing from a mobile phone in Japan, the same national format (02787-XX-XXXX) applies. For businesses, displaying the number in international format (+81 2787 XX XXXX) is recommended to facilitate overseas contact.