Area Code 871 – Coahuila

Overview of Area Code 871

Area code 871 is a geographic numbering plan area (NPA) within the Mexican national numbering plan, conforming to ITU-T E.164 standards. It serves the southeastern portion of the state of Coahuila de Zaragoza, with the city of Torreón as its principal urban center. This area code is part of the North American Numbering Plan (NANP) region assigned to Mexico, although dialing procedures follow Mexican national regulations.

Geographic Coverage and Jurisdiction

The 871 area code encompasses the municipalities of Torreón, Matamoros, and parts of the surrounding Laguna Region. Torreón is a major industrial and commercial hub, known for its cotton processing, metallurgy, and automotive industries. The region is part of the larger Comarca Lagunera metropolitan area, which also includes cities in the neighboring state of Durango (served by area code 871 for Coahuila side and 618 for Durango side). Administrative jurisdiction falls under the Federal Telecommunications Institute (IFT) in Mexico, which oversees numbering resource allocation.

Dialing Formats and Procedures

For local calls within the 871 area code, users must dial the 3-digit area code followed by the 7-digit local number, resulting in a 10-digit dialing sequence: 871 XXX XXXX. This applies even for calls between neighboring towns within the same area code. For national long-distance calls from other parts of Mexico, dial the long-distance prefix 01, then the area code and number: 01 871 XXX XXXX. For international callers, the format is: +52 871 XXX XXXX (or 011 52 871 XXX XXXX when dialing from the US/Canada).

Numbering and Overlay Considerations

Currently, there is no overlay code for the 871 area; it remains a standalone geographic code. However, due to growing demand, the IFT may introduce an overlay in the future, which would require 10-digit dialing (already in place) and could add a new area code to the same region. Subscribers in the 871 area have access to both fixed-line and mobile services, with mobile numbers using the same geographic prefix but assigned to mobile operators. Number portability allows users to retain their numbers when switching carriers, including between fixed and mobile services, subject to IFT regulations.

Caller Instructions

Local callers within the 871 region should simply dial the 10-digit number (area code + local number). Callers from other parts of Mexico must include the national long-distance prefix 01 before the 10-digit number. International callers must use their country's exit code (e.g., 011 from the US) followed by Mexico's country code 52, then the area code and local number. It is important to note that when dialing a Mexican number from abroad, the leading '0' of the national prefix is omitted.

For example, to call a business in Torreón from abroad, one would dial +52 871 234 5678. From within Mexico (outside 871), dial 01 871 234 5678. This ensures proper routing through the PSTN and mobile networks.