Area Code 3558 – Isperihovo

Overview of Area Code 3558 (Isperihovo, Bulgaria)

Area code 3558 is a geographic National Destination Code (NDC) assigned within the Bulgarian numbering plan, as administered under the ITU-T E.164 standard. It serves the town of Isperihovo and its surrounding administrative area, located in the Pazardzhik Province of southern Bulgaria. This code is part of the country's fixed-line PSTN network, traditionally operated by the incumbent telecom provider and now accessible through various alternative fixed-line operators.

Geographic Coverage and Administrative Jurisdiction

The 3558 area code covers the municipality of Isperihovo, which includes the town itself and several adjacent villages. The region falls under the broader Pazardzhik District, a key administrative and agricultural hub in the Thracian Plain. The code is geographically allocated, meaning that the tariff and routing are based on the physical location of the subscriber's line. Calls to numbers within this code are charged as national fixed-line calls when dialed from other Bulgarian regions.

Dialing Formats and Instructions

For callers within Bulgaria, the national trunk prefix 0 is used before the area code. Thus, to call a local number in Isperihovo, you would dial: 0 3558 XXX XXX (where X represents the subscriber's 6-digit line number). For example, a local number might be 0 3558 123456.

For international callers, the Bulgarian country code +359 replaces the trunk prefix. Therefore, the same number would be dialed as +359 3558 123456. Note that the leading '0' is omitted when dialing from abroad.

Local calls within the same area code may be made using only the subscriber number, depending on the operator's dialing plan, but it is always safe to use the full national format.

Overlay and Numbering Considerations

As of the latest ITU-T operational bulletins, there is no overlay code for the 3558 area. The numbering capacity is sufficient for the local demand, and no changes are anticipated in the near future. However, with the ongoing migration to VoIP and NGN (Next Generation Networks), some fixed-line services may be delivered over IP, but the geographic NDC remains unchanged for routing and tariff purposes.

Practical Guidance for Callers

• Local callers within Isperihovo should dial the national format: 0 3558 123456.
• Callers from other Bulgarian cities use the same national format.
• International callers must use the international format: +359 3558 123456, ensuring they replace the leading '0' with the country code.
• For emergency services or directory assistance, always use the national short codes (e.g., 112 for emergencies).

Understanding the correct dialing procedure ensures efficient call routing and avoids misdialed numbers. This area code remains an integral part of Bulgaria's telecommunications infrastructure, serving the community of Isperihovo reliably.