Area Code 358 – Nganjuk

Overview of Area Code 358

Area code 358 is a geographic National Destination Code (NDC) within the Indonesian public switched telephone network (PSTN), assigned to the Nganjuk Regency in the province of East Java (Jawa Timur). This code is part of the +62 country calling code and is used for fixed-line (landline) services. Nganjuk is located in the western part of East Java, approximately 100 kilometers southwest of Surabaya, and is known for its agricultural production and historical sites.

Geographic Coverage and Administrative Jurisdiction

The 358 area code covers the entire administrative region of Nganjuk Regency, including its capital, Nganjuk city, and surrounding districts such as Tanjunganom, Prambon, and Rejoso. The code is exclusively for fixed-line telephony, and numbers are allocated to residential, business, and government subscribers within the regency. Mobile numbers in Indonesia are non-geographic and use separate prefixes (e.g., 0811, 0852), so they are not affected by this area code.

Dialing Formats

To call a fixed-line number in Nganjuk from within Indonesia, you must dial the trunk prefix 0, followed by the area code 358 and the subscriber number. The subscriber number typically consists of 5 to 7 digits, making the total national significant number (NSN) length 8 to 10 digits (excluding the trunk prefix). For example, a local number might be 123456; from outside the area, you would dial 0358-123456.

When calling from abroad, you must dial the international access code (e.g., 00 from most countries, or +), followed by Indonesia's country code 62, then the area code without the leading zero, and the subscriber number. For instance, to call the same number from the United States, you would dial 011 62 358 123456, or from a mobile phone, +62 358 123456.

Overlay and Numbering Plan Considerations

As of the latest ITU-T E.164 national numbering plan updates, area code 358 does not have an overlay code. The numbering plan for Nganjuk is closed, meaning that local calls within the area code do not require the area code; you can simply dial the subscriber number. However, for calls from other areas, the full national format (0-358-XXXXXXX) is mandatory.

Caller Instructions

• Local callers (within Nganjuk): Dial only the subscriber number (e.g., 123456).
• National callers (from other Indonesian cities): Dial 0358 followed by the subscriber number (e.g., 0358-123456).
• International callers: Dial your country's exit code, then 62, then 358, then the subscriber number (e.g., +62 358 123456).

Always verify the current number length with your service provider, as the national numbering plan may undergo changes.