Area Code 373 – Dompu

Overview of Area Code 373

Area code 373 is a geographic National Destination Code (NDC) within the Indonesian numbering plan, assigned to the Dompu Regency (Kabupaten Dompu) on the island of Sumbawa, West Nusa Tenggara (Nusa Tenggara Barat) province. This code is used for fixed-line (PSTN) services within the regency, covering the administrative capital Dompu and surrounding districts such as Woja, Kempo, and Hu'u. The geographic allocation follows ITU-T E.164 recommendations, ensuring that calls to this region are routed through the national PSTN infrastructure.

Dialing Formats

When dialing a fixed-line number in Dompu from within Indonesia, the trunk prefix 0 is used, followed by the area code and the subscriber number. The complete national format is 0-373-XXXXXXX, where the subscriber number typically consists of 5 to 7 digits, making the total national significant number (NSN) length between 8 and 10 digits. For international callers, the country code for Indonesia is +62, and the leading trunk prefix '0' is omitted. The international dialing format becomes +62-373-XXXXXXX. For example, a local number in Dompu might be dialed as 0373-12345 domestically, while international callers would dial +62 373 12345.

Geographic Coverage and Administration

Area code 373 is administered under the jurisdiction of the Indonesian Telecommunication Regulatory Authority (BRTI) and is allocated to PT Telkom Indonesia as the primary fixed-line operator. The code covers the entire Dompu Regency, which is geographically located on the eastern part of Sumbawa Island. The region is known for its agricultural economy and the famous Lakey Beach surfing area. Fixed-line penetration in this region is relatively low compared to mobile usage, but the code remains essential for government offices, businesses, and residential landlines.

Caller Instructions

• Local callers within Dompu: If you are calling from another fixed-line number within the same area code, you may need to dial the subscriber number directly (without the area code) depending on the local network configuration. However, for clarity and to avoid misdialing, it is always safe to include the area code: 0373-XXXXXXX.
• Domestic callers from other regions in Indonesia: Dial 0373 followed by the subscriber number. For example, from Jakarta, you would dial 0373-12345.
• International callers: Dial your country's international access code (e.g., 00 from most countries, or +), then Indonesia's country code 62, then the area code without the leading '0', and the subscriber number. For instance, from the US, you would dial 011 62 373 12345.

Overlay and Numbering Considerations

Currently, there is no overlay code for Dompu; area code 373 is the sole geographic code for the regency. However, as with many regions in Indonesia, the government has been encouraging the migration from PSTN to VoIP and mobile services, which may affect the future demand for fixed-line numbers. Number portability is available for mobile services, but fixed-line numbers are generally tied to the geographic location. When calling a fixed-line number in Dompu, ensure that you have the correct number of digits, as subscriber numbers may vary in length. For any discrepancies, contact your service provider or consult the official BRTI numbering database.