Area Code 742 – Guerrero
The phone area code for Guerrero is 742 (international format +52742). Browse local exchange codes (NXX) and carrier assignments below.
📞 Exchange Codes (NXX) for Area Code 742
Select a central office code to view local carrier data and detailed information
📍 Geographic Location of Guerrero
Geographic Coverage and Administrative Context
The Mexican area code +52 742 is a geographic National Destination Code (NDC) assigned to the northern and central regions of the state of Guerrero. This code serves municipalities including Taxco de Alarcón, Iguala de la Independencia, and Teloloapan, as well as numerous smaller localities within the Sierra Norte and part of the Tierra Caliente regions. Administratively, these areas fall under the jurisdiction of the Federal Telecommunications Institute (IFT) for numbering resource allocation, but local telephony services are provided by both incumbent operators (e.g., Telmex) and competitive carriers (e.g., Totalplay, Megacable) that have deployed infrastructure in the region.
Dialing Formats and Caller Instructions
For callers within Mexico, dialing a fixed-line number in the 742 area requires the national long-distance prefix 01, followed by the area code and the seven-digit local number. For example, to reach a landline in Taxco, you would dial: 01 742 123 4567. For international callers, the format follows the ITU-T E.164 standard: the Mexican country code +52, then the area code (without the leading '0' or '01'), and the local number. Thus, from the United States or any other country, you would dial: +52 742 123 4567.
It is important to note that Mexico has implemented an eight-digit dialing plan for all fixed and mobile numbers since August 2019. This means that within the same area code, you must dial the full ten-digit number (area code + local number) even for local calls. For example, a local call within Taxco would be dialed as 742 123 4567 without the '01' prefix. This change eliminated the need for the '044' prefix for mobile calls and simplified dialing across the country.
Overlay and Numbering Considerations
Currently, the 742 area code does not have an overlay code, meaning it is the sole NDC for its geographic coverage. However, due to growing demand for telecommunication services in the region, the IFT may introduce an overlay in the future. If an overlay is implemented, ten-digit dialing will become mandatory for all calls within the area, and new numbers may be assigned with the overlay code. For now, the number length remains fixed at ten digits (area code + seven-digit subscriber number) for both local and long-distance calls.
Practical Examples for Callers
- Local call (within 742): Dial 742 123 4567.
- National long-distance call (from Mexico City): Dial 01 742 123 4567.
- International call (from the USA): Dial 011 52 742 123 4567 (or +52 742 123 4567 from mobile).
When dialing from a mobile phone in Mexico, the '01' prefix is often omitted, and you can dial directly as 742 123 4567 for long-distance calls. However, to avoid confusion, it is recommended to use the full ten-digit format.
Service and Usage Notes
Geographic numbers under +52 742 are primarily used for fixed-line services, including PSTN and VoIP-based landlines. They are not portable to mobile networks, but fixed-line number portability is available between fixed operators. Businesses in the region often use these numbers for customer service and administrative lines. For callers, charges for calling these numbers depend on the caller's own tariff plan; international calls will incur international rates, while national long-distance calls may be included in some mobile plans.