Area Code 290 – Ca Mau province

Geographic Overview and Administrative Jurisdiction

The area code 290 is the National Destination Code (NDC) assigned to the province of Cà Mau in Vietnam. Geographically, Cà Mau is the southernmost province of the country, forming a peninsula bordered by the East Sea to the east and south, and the Gulf of Thailand to the west. The province is part of the Mekong Delta region and shares administrative borders with Bạc Liêu and Kiên Giang provinces. The primary administrative and economic center is Cà Mau City, which serves as the provincial capital. Other significant towns and districts using this code include U Minh, Thới Bình, Trần Văn Thời, Cái Nước, Đầm Dơi, Phú Tân, and Năm Căn.

Dialing Formats and Caller Instructions

For domestic callers within Vietnam, the local dialing format for a fixed-line subscriber in Cà Mau is: 0-290-XXX-XXXX (where X represents the subscriber number). The leading '0' is the trunk prefix used for domestic long-distance calls. For example, to call a landline in Cà Mau from Ho Chi Minh City, you would dial 0290 123 4567.

For international callers, the leading '0' is omitted, and the country code for Vietnam (+84) is used. The international format becomes: +84-290-XXX-XXXX. Thus, a caller from the United States would dial 011-84-290-123-4567, while a caller from the United Kingdom would dial 00-84-290-123-4567.

Numbering Plan and Overlay Considerations

Subscriber numbers in Cà Mau are typically 7 digits long, resulting in a total length of 10 digits (including the trunk prefix '0') for domestic dialing. As of the current Vietnamese numbering plan, there are no overlay codes in Cà Mau; the 290 code is exclusively assigned to this province. However, due to the increasing demand for telecommunication services, the Ministry of Information and Communications of Vietnam periodically reviews numbering resources. Should an overlay be introduced in the future, local calls would require the full 10-digit dialing (including the trunk prefix) even for calls within the same province.

Network Infrastructure and PSTN Services

Fixed-line services in Cà Mau are primarily provided by the state-owned incumbent operator VNPT, along with other licensed carriers such as Viettel and FPT Telecom. These services operate over the Public Switched Telephone Network (PSTN) and increasingly over VoIP (Voice over Internet Protocol) infrastructure. The geographic code 290 is used for both traditional analog lines and VoIP-based fixed lines that are registered to physical addresses within the province. It is important to note that number portability exists in Vietnam, allowing subscribers to retain their numbers when switching operators, but the geographic significance of the code remains tied to the original location of the number.