Area Code 331 – Jember
The phone area code for Jember is 331 (international format +62331). Browse local exchange codes (NXX) and carrier assignments below.
📍 Geographic Location of Jember
Geographic Coverage and Administrative Jurisdiction
The Indonesian country code +62, when followed by the area code 331, routes calls to the eastern part of East Java Province. Specifically, the +62 331 numbering area covers the administrative city of Jember and its surrounding regency, including districts such as Kaliwates, Sumbersari, Patrang, and Ajung. This geographic code is assigned under the national numbering plan administered by the Indonesian Telecommunication Regulatory Authority (BRTI) and follows the ITU-T E.164 recommendation for international telecommunication numbering.
Dialing Formats and Caller Instructions
For callers within Indonesia, the trunk prefix 0 is used before the area code. Thus, a local call to a fixed-line subscriber in Jember requires dialing 0331-XXXXXXX (where X represents the subscriber's seven-digit number). For international callers, the format is +62 331-XXXXXXX or 011-62-331-XXXXXXX depending on the origin country's international dialing prefix. When dialing from a mobile phone, the same international format applies, and the leading zero of the national trunk prefix is omitted.
Geographic Significance and Overlay Considerations
Jember is a major economic and educational hub in the eastern part of East Java, known for its tobacco industry and the University of Jember. The 331 area code is exclusively geographic, meaning that numbers are tied to a physical location. As of the latest updates, there is no overlay code for this region; therefore, local calls within the Jember area do not require an area code if dialed from a landline within the same numbering area. However, with the increasing adoption of VoIP and mobile services, callers should be aware that some numbers may be ported to non-geographic networks, but the dialing format remains unchanged.
Technical Considerations for Businesses and Call Centers
For enterprises operating in Jember, it is essential to ensure that their telephony infrastructure correctly handles the national and international dialing formats. When configuring PBX systems or VoIP gateways, the area code 331 must be programmed as a national destination code (NDC) to route calls appropriately. For inbound international calls, the country code +62 and area code 331 must be recognized to avoid misrouting. Additionally, businesses should consider the cost implications: calls from mobile networks to geographic numbers may be charged at higher rates than on-net calls, and international calls will incur IDD tariffs.
In summary, the +62 331 area code is a vital part of Indonesia's telecommunications infrastructure, serving the Jember region with reliable fixed-line services. Understanding its dialing conventions ensures seamless connectivity for both local and international callers.