Area Code 4100 – Stoletovo, St. Zagora

The +359 4100 area code is a geographic destination code assigned to the town of Stoletovo and its immediate vicinity within the Stara Zagora Province of Bulgaria. This code is part of the national numbering plan administered by the Communications Regulation Commission (CRC) under the framework of ITU-T E.164. As a geographic prefix, it routes calls to a fixed geographic location, typically served by copper PSTN lines, fiber-optic infrastructure, or fixed wireless access points.

Geographic Coverage and Administrative Jurisdiction

Stoletovo is a small settlement located in the central part of Bulgaria, within the municipality of Stara Zagora. The area code 4100 covers the town itself and possibly a few surrounding hamlets. Administratively, it falls under the Stara Zagora Province, which is an important economic and agricultural region. The nearest major urban center is Stara Zagora city, which uses the area code 42. Calls from Stoletovo to Stara Zagora city require dialing the national trunk prefix 0 followed by the area code 42 and the subscriber number.

Dialing Formats and Caller Instructions

For local callers within Bulgaria, the dialing format is: 0 4100 XXX XXX (where X represents the subscriber's local number). The leading 0 is the trunk prefix used for domestic calls. For international callers, the format is: +359 4100 XXX XXX (or 00359 4100 XXX XXX from most countries). The international format omits the trunk prefix 0. When dialing from a mobile phone within Bulgaria, the same national format (0 4100 ...) applies, but note that mobile operators may require the full national number without the leading 0 if you are using a local SIM and dialing in international format – always follow your operator's guidelines.

Numbering and Overlay Considerations

The subscriber numbers within the 4100 area code are typically 6 to 7 digits long, making the total national significant number (NSN) 8 to 9 digits (including the area code). As of the latest CRC updates, there is no overlay plan for this area, meaning the 4100 code is unique to Stoletovo and no additional codes share the same geographic area. However, number portability allows subscribers to retain their numbers when switching fixed-line operators, but the geographic significance remains tied to the original location.

Practical Usage and Services

Businesses and residents in Stoletovo use this code for standard fixed-line telephony, including voice calls and legacy fax services. With the expansion of fiber-optic networks, many lines now support VoIP technology, but the number remains geographically associated. For international callers, it is essential to use the correct country code (+359) and to drop the leading 0 of the national format. For example, to call a Stoletovo number with subscriber digits 123456, an international caller would dial +359 4100 123456.