Area Code 3766 – Biser
The phone area code for Biser is 3766 (international format +3593766). Browse local exchange codes (NXX) and carrier assignments below.
📞 Exchange Codes (NXX) for Area Code 3766
Select a central office code to view local carrier data and detailed information
📍 Geographic Location of Biser
Geographic Overview
The +359 3766 prefix is a geographic National Destination Code (NDC) assigned to the town of Biser and its surrounding settlements in Haskovo Province, south-central Bulgaria. Biser lies near the Maritsa River, close to the border with Greece, and is part of the municipality of Svilengrad. The area code covers the fixed-line telephone network within this rural locality.
Dialing Formats
When calling a landline in Biser from within Bulgaria, subscribers must dial the trunk prefix 0 followed by the area code and the subscriber number. The national format is 0 3766 XXX XX, where the local number typically consists of six digits after the area code. For example, a local number might be dialed as 03766 12345 from any Bulgarian phone.
For international callers, the Bulgarian country code +359 replaces the leading zero. Thus, the same number is dialed as +359 3766 12345 from abroad. It is important to omit the trunk prefix '0' when dialing from outside Bulgaria.
Geographic Allocation and Numbering
According to the Communications Regulation Commission (CRC) of Bulgaria, the 3766 area code is part of the geographic numbering plan, which means that the tariff for calls to this number is based on its geographic location. Calls made from mobile phones to Biser landlines may incur higher rates depending on the caller's mobile plan. The code is not portable to other geographic areas; it remains tied to the Biser exchange.
Caller Instructions
Local callers within Biser can often dial the subscriber number directly without the area code, depending on the local dialing rules. However, for clarity and to avoid misdialing, it is recommended to always use the full national format. For callers from other Bulgarian regions, dial 0 3766 followed by the local number. For international callers, use +359 3766 and the local number.
As with all Bulgarian landlines, calls to Biser numbers are routed over the PSTN and may be subject to standard call charges. VoIP users should ensure they enter the number in international format to avoid routing errors.