Area Code 983 – Serui

Geographic Overview and Jurisdiction

The +62 983 country calling code prefix is the geographic National Destination Code (NDC) assigned to the Serui telephony exchange area in the Indonesian province of Papua. Serui serves as the administrative capital of the Yapen Islands Regency, located on Yapen Island in Cenderawasih Bay. This code covers the fixed-line PSTN network for Serui town and its surrounding administrative districts within the regency. As a geographic code, it is tied to a specific physical location, and calls are routed via the terrestrial and submarine telecommunications infrastructure of eastern Indonesia.

Dialing Formats and Number Structure

When dialing a fixed-line number in Serui from within Indonesia, subscribers must use the trunk prefix '0' followed by the area code and the local subscriber number. The complete national format is 0 983 XXX XXXX, where '983' is the NDC and the subscriber number typically consists of 6 to 7 digits. For example, a local number might be dialed as 0983 123 4567.

International callers must replace the leading '0' with the Indonesian country code +62, resulting in the format +62 983 XXX XXXX. For instance, an international caller would dial +62 983 123 4567. When dialing from abroad, it is essential to omit the trunk prefix '0' and use the '+' sign followed by the country code, or the appropriate international access code (e.g., 011 from the US, 00 from many European countries).

Caller Instructions and Overlay Considerations

For local callers within the Serui area, calls to other fixed-line numbers in the same NDC may be placed using only the subscriber number, depending on the local dialing plan. However, for clarity and to avoid misdialing, it is recommended to always use the full national format, especially when calling from mobile phones. There are no overlay codes currently implemented for the 983 area, meaning the NDC is unique to this region.

For callers outside Indonesia, it is important to note that Indonesian fixed-line numbers are not mobile numbers and cannot be reached via SMS. Additionally, the cost of an international call to +62 983 will vary depending on the caller's carrier and the applicable international tariff. For travelers within Indonesia, using a local SIM card and dialing the national format (0 983...) is the most cost-effective method.

Technical and Regulatory Context

As part of the Indonesian numbering plan administered by the Ministry of Communication and Information Technology (Kominfo), the 983 NDC is allocated for fixed-line services. The network infrastructure is primarily copper-based PSTN, though some areas may have been upgraded to fiber or VoIP backhaul. Number portability is not generally available for fixed geographic numbers in Indonesia, so the prefix remains a reliable indicator of the subscriber's physical location.