Area Code 966 – Arriaga/Tonala, CHIS
The phone area code for Arriaga/Tonala, CHIS is 966 (international format +52966). Browse local exchange codes (NXX) and carrier assignments below.
📞 Exchange Codes (NXX) for Area Code 966
Select a central office code to view local carrier data and detailed information
📍 Geographic Location of Arriaga/Tonala, CHIS
Geographic Coverage and Administrative Jurisdiction
Area code 966 is a geographic National Destination Code (NDC) assigned to the southeastern region of the state of Chiapas, Mexico. It serves the municipalities of Arriaga and Tonalá, along with their surrounding localities. This area lies along the Pacific coastal plain, near the border with Oaxaca, and is an important commercial and transit hub. The code is administered under Mexico's national numbering plan, which follows ITU-T E.164 recommendations.
Primary Cities and Local Dialing
The main cities served by prefix 966 are Arriaga and Tonalá. Arriaga is known as the 'Gateway to Chiapas' due to its strategic location on the Pan-American Highway, while Tonalá is a regional economic center with a significant port and tourist activity. Local calls within the 966 area are dialed using the 7-digit subscriber number only (e.g., 123-4567). For calls from other area codes within Mexico, the full national format is required: 01 966 123 4567. International callers must use the country code and drop the trunk prefix: +52 966 123 4567.
Overlay and Numbering Considerations
As of the latest ITU and Mexican Federal Telecommunications Institute (IFT) updates, there is no overlay code for 966. This means that the area code is not shared with another NDC in the same geographic region. However, number exhaustion is a possibility, and the IFT may introduce an overlay in the future. In such cases, ten-digit dialing would become mandatory. Currently, local calls within the 966 area can be made using seven digits, but it is always safe to use the full ten-digit format to ensure compatibility with future changes.
Caller Instructions
- Local callers (within 966): Dial the 7-digit subscriber number directly. Example: 123-4567.
- National callers (from other Mexican area codes): Dial the long-distance prefix 01, then 966, then the 7-digit number. Example: 01 966 123 4567.
- International callers: Dial the international access code (e.g., 011 from the US/Canada), then Mexico's country code +52, then 966, then the 7-digit number. Example: +52 966 123 4567.
When dialing from a mobile phone in Mexico, it is common to use the +52 country code even for national calls, especially when roaming or using VoIP services. This practice is accepted and often required for interoperability.
Economic and Social Context
The region served by 966 is characterized by a mix of agricultural, commercial, and tourism activities. Tonalá's proximity to the Pacific Ocean and its beaches, such as Puerto Arista, attracts national tourism, while Arriaga serves as a vital land transport link. Understanding the correct dialing procedures is essential for businesses and travelers to ensure seamless communication with this part of Chiapas.