Area Code 212 – Son La province

Overview of Area Code 212 (Son La Province, Vietnam)

Area code 212 is a geographic National Destination Code (NDC) assigned to the landline telephone network of Son La province, located in the Northwest region of Vietnam. This code is part of the national numbering plan administered by the Vietnam Telecommunications Authority (VNTA) under the Ministry of Information and Communications, following ITU-T E.164 recommendations. The province shares borders with China and Laos, and its administrative capital is Son La City, which is the primary urban center served by this code.

Geographic Coverage and Administrative Jurisdiction

The 212 area code covers the entire province of Son La, including its 12 districts: Son La City, Quynh Nhai, Thuan Chau, Muong La, Bac Yen, Phu Yen, Mai Son, Yen Chau, Sop Cop, Song Ma, Moc Chau, and Van Ho. These areas are served by fixed-line networks operated by major Vietnamese carriers such as VNPT (Vinaphone), Viettel, and other licensed PSTN providers. The code is exclusively for wireline services; mobile numbers in Vietnam are assigned separate non-geographic prefixes (e.g., 03x, 05x, 07x, 08x, 09x) and are not tied to this area code.

Dialing Formats and Number Structure

When calling a fixed-line number in Son La from within Vietnam, subscribers must dial the trunk prefix 0, followed by the area code 212, and then the subscriber number, which typically consists of 7 digits. The complete national format is: 0-212-XXX-XXXX (e.g., 0212 345 6789). For international callers, the country code for Vietnam is +84, so the international format becomes +84-212-XXX-XXXX, omitting the leading trunk prefix '0'. For example, a caller from the United States would dial 011-84-212-345-6789.

Local and International Caller Instructions

For local calls within Son La, subscribers can often dial the 7-digit subscriber number directly without the area code, depending on the carrier's local dialing plan. However, for clarity and to avoid misdialing, it is recommended to always include the area code. For callers from other provinces in Vietnam, dial 0212 followed by the subscriber number. For international callers, replace the leading '0' with the international access code of your country (e.g., 00 from most European countries) and then dial 84 212 followed by the subscriber number.

Overlay and Numbering Plan Considerations

As of the latest VNTA updates, there is no overlay code for Son La; the 212 area code remains the sole geographic code for the province. However, due to the increasing demand for telecommunication services, the government has implemented a plan to migrate all fixed-line subscriber numbers to a uniform length of 7 digits, which is already in effect. No additional digits are required for calls within Vietnam. For VoIP and IP-based services, the same numbering rules apply, ensuring seamless interoperability between traditional PSTN and modern IP networks.