Area Code 328 – Sumenep
The phone area code for Sumenep is 328 (international format +62328). Browse local exchange codes (NXX) and carrier assignments below.
📍 Geographic Location of Sumenep
Geographic Overview
The area code 328 is a geographic National Destination Code (NDC) assigned to the telecommunications network serving Sumenep, a regency located on the eastern coast of Madura Island in East Java Province, Indonesia. This code is part of the Indonesian national numbering plan under ITU-T E.164, and it is used for fixed-line (PSTN) services within the Sumenep administrative area, which includes the capital city of Sumenep and surrounding districts such as Batuan, Gapura, and Kalianget.
Dialing Formats
For callers within Indonesia, the national trunk prefix 0 must be dialed before the area code. The local number length varies between 5 and 7 digits, depending on the exchange capacity and subscriber density. The complete national format is: 0-328-XXXXXXX (where X represents the local subscriber number).
For international callers, the Indonesian country code +62 replaces the leading zero. The international dialing format is: +62-328-XXXXXXX. For example, to call a fixed line in Sumenep from abroad, you would dial +62 328 123456 (using a hypothetical local number).
Local and International Calling Instructions
- Local callers within Sumenep: Depending on the specific exchange and carrier, local calls may require only the subscriber number (7 digits) without the area code. However, due to varying practices, it is recommended to always use the full national format 0328-XXXXXXX to ensure connectivity.
- Callers from other Indonesian regions: Dial 0328-XXXXXXX (trunk prefix 0 + area code 328 + local number).
- International callers: Dial +62 328 XXXXXXX (country code + area code without the leading 0 + local number).
Regulatory and Technical Notes
As a geographic code, 328 is tied to the physical location of the subscriber's line. However, with the advent of VoIP and number portability, some services may be routed over IP networks, but the number remains associated with Sumenep for regulatory and emergency services purposes. The Indonesian Telecommunications Regulatory Authority (BRTI) oversees the allocation and management of this code.
For businesses or individuals requiring a presence in Sumenep, obtaining a fixed-line number with the 328 code can enhance local credibility and accessibility. It is important to note that this code is not used for mobile services; mobile numbers in Indonesia begin with other prefixes (e.g., 0811, 0821, etc.) and are non-geographic.