Area Code 3631 – Momchilgrad
The phone area code for Momchilgrad is 3631 (international format +3593631). Browse local exchange codes (NXX) and carrier assignments below.
📞 Exchange Codes (NXX) for Area Code 3631
Select a central office code to view local carrier data and detailed information
📍 Geographic Location of Momchilgrad
Geographic Overview and Administrative Jurisdiction
The +359 3631 prefix is a geographic National Destination Code (NDC) assigned to the fixed-line telephone network of Momchilgrad, a town located in the Kardzhali Province of southern Bulgaria. This area code covers the urban territory of Momchilgrad and its immediate surrounding settlements within the Eastern Rhodopes mountain region. Administratively, the code falls under the jurisdiction of the Bulgarian Communications Regulation Commission (CRC), which oversees the national numbering plan in accordance with ITU-T E.164 recommendations.
Dialing Formats and Number Structure
When calling a fixed-line subscriber in Momchilgrad from within Bulgaria, the national trunk prefix '0' is dialed before the area code, followed by the local subscriber number. The complete national format is: 0 3631 XXX XX, where '0' is the trunk prefix, '3631' is the geographic NDC, and the remaining digits constitute the local number. For international callers, the country code +359 is used, and the leading '0' is omitted, resulting in the format: +359 3631 XXX XX. For example, a local number such as 123 45 would be dialed as 03631 12345 domestically and +359 3631 12345 from abroad.
Geographic Coverage and Local Significance
The Momchilgrad area code serves a region known for its diverse ethnic composition and historical significance. The town itself is an administrative center for the surrounding municipalities, providing essential public services, commercial activities, and cultural institutions. Fixed-line services in this area are primarily provided by the incumbent operator, A1 Bulgaria (formerly Mtel) and alternative carriers that offer local loop unbundling. The geographic nature of this prefix means that the tariff structure is typically lower for on-net calls within the same region, and higher for calls to mobile networks or other geographic zones.
Overlay and Number Portability Considerations
As of the latest CRC updates, there are no overlay codes for the 3631 area, meaning that callers within the region do not need to dial the area code for local calls if the number is within the same exchange. However, due to number portability, a subscriber who has moved to another geographic area may retain their 3631 number, but calls to that number will be routed to the new location. This can affect local call tariffs and emergency services location identification. It is always advisable for callers to confirm the current location of the called party if they suspect portability has occurred.
Guidance for Domestic and International Callers
For domestic callers outside the Momchilgrad area, dial the full national number: 0 3631 XXX XX. For international callers, replace the trunk prefix with the Bulgarian country code: +359 3631 XXX XX. When dialing from a mobile phone within Bulgaria, the national format is typically used, but some mobile operators may require the international format depending on the user's settings. It is recommended to store numbers in international format (+359 3631 XXX XX) to ensure compatibility across different networks and when traveling abroad.