Area Code 426 – Mamuju

Overview of Area Code 426 (Mamuju, Indonesia)

Area code 426 is a geographic National Destination Code (NDC) assigned to the city of Mamuju, the capital of West Sulawesi Province, Indonesia. It follows the ITU-T E.164 international numbering standard and is used for fixed-line (PSTN) services within the Mamuju administrative region, which includes the surrounding regencies of Central Mamuju, Pasangkayu, and parts of the Polewali Mandar area. The code is part of Indonesia's national numbering plan, administered by the Ministry of Communication and Information Technology (Kominfo) and the Indonesian Telecommunication Regulatory Authority (BRTI).

Geographic Coverage and Administrative Jurisdiction

The 426 area code covers the western coastal region of Sulawesi Island, specifically the province of West Sulawesi. Mamuju serves as the provincial capital and is the primary urban center, hosting government offices, commercial hubs, and residential districts. The code also extends to nearby towns such as Simboro, Tapalang, and Budong-Budong, which are interconnected through the local PSTN network. As a geographic code, its allocation is tied to physical telephone exchanges, meaning that the number range is not portable outside the Mamuju area.

Dialing Formats and Caller Instructions

For callers within Indonesia, the local dialing format for a Mamuju fixed-line number is 0 426 XXX XXXX, where the leading 0 is the national trunk prefix. For example, to call a Mamuju landline from Jakarta, you would dial 0426 123 4567. For international callers, the format follows the E.164 standard: +62 426 XXX XXXX, replacing the trunk prefix with Indonesia's country code +62. Thus, a caller from the United States would dial 011 62 426 123 4567, while a caller from the UK would dial 00 62 426 123 4567. It is essential to omit the leading 0 when dialing from abroad.

Numbering Structure and Overlay Considerations

Mamuju fixed-line numbers typically consist of 7 to 8 digits after the area code, depending on the exchange capacity and subscriber density. The Indonesian numbering plan allows for variable subscriber lengths within the same NDC to accommodate growth. Currently, there is no overlay code for Mamuju; the 426 code is exclusively used for the region. However, as demand for fixed-line services evolves, Kominfo may introduce additional digits or overlay codes, but such changes are not imminent.

Practical Usage and Caller Tips

When calling a Mamuju number from a mobile phone within Indonesia, dial the full national format 0426 followed by the subscriber number. For international callers, ensure you use the correct international access code (e.g., 011 from North America, 00 from most European countries) before the country code and area code. Since Mamuju is a developing region, fixed-line penetration is lower than in major cities, and many residents rely on mobile services. However, businesses, government offices, and hotels in Mamuju commonly use 426 numbers. If you encounter a number with an unexpected length, verify the subscriber number with the local directory or your service provider.