Area Code 312 – Mobile Network

Colombia Mobile Prefix 312: Technical Overview

In the Colombian national numbering plan, administered by the Comisión de Regulación de Comunicaciones (CRC) under ITU-T E.164 guidelines, the prefix 312 is designated as a non-geographic mobile network code. This means that numbers beginning with 312 are not tied to any specific city or department; they are allocated to mobile network operators (MNOs) and mobile virtual network operators (MVNOs) for nationwide service.

Colombian mobile numbers consist of the country code +57, followed by a three-digit mobile prefix (e.g., 312) and a seven-digit subscriber number, yielding a total national significant number length of 10 digits. For example, a typical number would be formatted as +57 312 123 4567 in international format, or 312 123 4567 when dialed locally within Colombia.

Numbering and Routing

Mobile prefixes in Colombia are not portable across operators in the traditional sense; however, mobile number portability (MNP) allows subscribers to retain their 312 number when switching providers. As a result, the prefix does not definitively identify the current operator, but it originally belonged to a specific MNO. The CRC allocates number blocks to carriers, and routing is determined by a centralized database that queries the current network.

For international callers, the correct dialing sequence is: +57 312 XXX XXXX (or 0057 312 XXX XXXX from countries using the international access prefix 00). For domestic callers, dialing the 10-digit number (312 XXX XXXX) is sufficient; the national trunk prefix '0' is not used for mobile calls. SMS and MMS messages to 312 numbers are addressed using the same international format, ensuring interoperability across global networks.

Regulatory and Commercial Aspects

312 numbers are allocated to both postpaid and prepaid services, and they support all standard mobile features, including voice, data, and messaging. The CRC has implemented measures to ensure fair competition and number resource efficiency. As of recent years, the 312 prefix has been used by major operators such as Comcel (now Claro) and others, but due to MNP, users may encounter 312 numbers on any Colombian network.

When contacting Colombian mobile numbers from abroad, be aware of potential charges for international calls and SMS. Within Colombia, calls between different mobile networks may incur additional charges depending on the caller's plan, but many current plans offer unlimited on-net and off-net minutes.

For businesses, 312 numbers are a reliable way to reach Colombian consumers, as mobile penetration exceeds 100% and most adults own a mobile device. When integrating 312 numbers into CRM systems or marketing campaigns, always use the international format to ensure proper routing and avoid errors.