Area Code 457 – Donggala

Overview of Area Code 457 (Donggala, Indonesia)

Area code 457 is a geographic National Destination Code (NDC) assigned to the Donggala region in Central Sulawesi, Indonesia. It is part of the country's E.164 numbering plan, where the full international dialing format is +62 457 xxx xxxx. This code serves the administrative regency of Donggala, including its capital and surrounding districts, and is primarily used for fixed-line PSTN services.

Geographic Coverage and Administrative Jurisdiction

The 457 area code covers the Donggala Regency (Kabupaten Donggala), which is located on the western coast of Central Sulawesi province. Key towns and districts within this code include Banawa, Labuan, and Sindue. The region is known for its coastal geography and proximity to the provincial capital, Palu, which uses a different area code (0451). Donggala's telecommunications infrastructure is managed by Indonesian fixed-line operators, with services delivered over both copper and fiber-optic networks.

Dialing Formats and Caller Instructions

• Local callers (within Indonesia): Dial the trunk prefix 0 followed by the area code and subscriber number: 0457 xxx xxxx. The subscriber number length typically ranges from 5 to 7 digits, depending on the exchange capacity.
• International callers: Dial the Indonesian country code +62, then the area code without the leading zero, followed by the subscriber number: +62 457 xxx xxxx.
• Example: If a local number is 0457 123 456, an international caller would dial +62 457 123 456.

Overlay and Numbering Considerations

As of the latest ITU-T and national numbering updates, area code 457 does not have an overlay code. This means that local calls within the Donggala area do not require an additional area code when dialing between fixed-line numbers in the same region. However, callers should always include the area code when dialing from mobile phones or from outside the region to ensure proper routing. The Indonesian numbering plan is managed by the Ministry of Communication and Informatics (Kominfo), and number allocations are periodically reviewed to accommodate population growth and technological changes.

Practical Usage and Business Implications

For businesses operating in Donggala, having a local fixed-line number with area code 457 establishes a physical presence and builds trust with local customers. For those outside Indonesia, understanding the correct international dialing format is essential to reach clients or partners in the region. It is also important to note that calls to Indonesian fixed-line numbers are typically charged at higher rates than local calls, and VoIP services may offer cost-effective alternatives for international communication.