Area Code 428 – Ocampo/San Felipe, GTO

Geographic Coverage and Administrative Jurisdiction

The +52 428 country calling code and area code combination is assigned to a geographic numbering zone within the state of Guanajuato (GTO), Mexico. This prefix serves the municipalities of Ocampo and San Felipe, along with their surrounding localities. These areas are situated in the northeastern part of Guanajuato, bordering the states of San Luis Potosí and Jalisco. The region is primarily rural and semi-urban, with economic activities centered on agriculture, livestock, and small-scale manufacturing. The administrative hub for this zone is the city of San Felipe, which acts as the main commercial and services center for the covered communities.

Dialing Formats and Number Structure

When calling a landline or mobile number within the +52 428 area code from abroad, the international format is +52 428 XXX XX XX. The national significant number comprises the two-digit area code (428) followed by a seven-digit subscriber number. For example, a local number might be formatted as +52 428 123 45 67 when dialed internationally.

For domestic calls placed from other area codes within Mexico, the standard dialing procedure requires the long-distance prefix 01 before the area code and subscriber number. Thus, a call from Mexico City to this region would be dialed as 01 428 123 45 67. However, if you are calling from a phone located within the same 428 area code, local dialing typically uses only the seven-digit subscriber number (e.g., 123 45 67), although some operators may still require the full ten-digit format due to overlay or technical updates. It is always advisable to confirm with your local service provider.

Caller Instructions and Practical Considerations

For international callers, always replace the plus sign (+) with your country's international access code (e.g., 011 from the US/Canada, 00 from many European countries) when dialing from a landline. From a mobile phone, the plus sign can usually be used directly. For example, a caller in the United States would dial 011 52 428 123 45 67.

As of the latest numbering plan updates, Mexico has not introduced overlay codes for this geographic area, meaning the 428 prefix remains exclusive to the Ocampo/San Felipe region. However, due to the growing adoption of VoIP and mobile services, some numbers may be ported or rerouted, but the geographic identity of the prefix remains intact. When dialing, ensure you include the correct international prefix and country code to avoid misrouting.

For local businesses and residents, it is common to display numbers in the format 428 XXX XX XX for domestic clarity. Visitors to the region should note that while mobile coverage is available, some remote areas may experience limited signal, and landline services remain the most reliable for fixed communications.