Area Code 3544 – Kostandovo
The phone area code for Kostandovo is 3544 (international format +3593544). Browse local exchange codes (NXX) and carrier assignments below.
📞 Exchange Codes (NXX) for Area Code 3544
Select a central office code to view local carrier data and detailed information
📍 Geographic Location of Kostandovo
Geographic Overview
The +359 3544 prefix is a geographic National Destination Code (NDC) assigned to the fixed-line telephone network serving the town of Kostandovo and its immediate surrounding areas in the Pazardzhik Province of southern Bulgaria. Kostandovo is situated in the western Rhodope Mountains, near the town of Velingrad, and falls under the administrative jurisdiction of the Velingrad Municipality. This numbering area is part of Bulgaria's national numbering plan, which adheres to ITU-T E.164 recommendations.
Dialing Formats and Usage
For callers within Bulgaria, reaching a fixed-line subscriber in Kostandovo requires dialing the trunk prefix 0, followed by the area code 3544 and the subscriber's local number, which typically consists of 5 to 6 digits. The complete national significant number (NSN) length is 9 digits, excluding the leading trunk prefix. The international dialing format for callers from abroad is +359 3544 XXX XXX (or +3593544XXXXXX), where the leading zero is omitted.
For example, a local call within Kostandovo would be dialed as 0 3544 12345, while an international caller would dial +359 3544 12345.
Network and Regulatory Notes
The 3544 area code is allocated for fixed-line services, primarily provided by the incumbent operator (formerly BTC, now A1 Bulgaria) and alternative fixed-line operators. As with most geographic codes in Bulgaria, number portability is available, allowing subscribers to retain their numbers when switching providers within the same geographic area. However, the geographic significance of the code remains tied to the physical location of the exchange.
There are no known overlay codes for this area; the 3544 code serves exclusively the Kostandovo region. Callers should note that calls to this prefix are charged as local or national fixed-line rates, depending on their own service provider and tariff plan.
For businesses or residents in Kostandovo, having a local geographic number can enhance local presence and trust. However, with the rise of VoIP and mobile services, many users opt for non-geographic numbers for flexibility, but geographic numbers like 3544 remain essential for traditional fixed-line connectivity and certain administrative purposes.