Area Code 28 – Ho Chi Minh City

Geographic Overview and Administrative Scope

Area code 28 is the National Destination Code (NDC) assigned to Ho Chi Minh City (formerly Saigon), the largest metropolitan area and economic hub of Vietnam. Under the ITU-T E.164 international numbering plan, the full international dialing format for a fixed-line subscriber in Ho Chi Minh City is +84 28 X XXX XXXX, where +84 is the Vietnam country calling code, 28 is the geographic area code, and the remaining eight digits constitute the subscriber number. This code replaced the former 11-digit local numbers (with area code 8) during Vietnam's national numbering reform implemented on 17 June 2017, unifying all fixed-line numbers in the city to a consistent 10-digit national significant number (NSN) format.

Geographic Coverage and Jurisdiction

The 28 area code serves all urban and suburban districts of Ho Chi Minh City, including the central business district (District 1), Cholon (Chinatown), and surrounding residential and industrial zones. The code is administered by the Vietnam Telecommunications Authority (VNTA) under the Ministry of Information and Communications. It is exclusively assigned to fixed-line PSTN services, including traditional copper lines, fiber-optic (FTTH) telephony, and ISDN. Mobile numbers in Vietnam are non-geographic and use distinct prefixes (e.g., 09x, 03x, 07x, 08x), so they are not affected by this area code.

Dialing Formats and Caller Instructions

For local callers within Vietnam, the domestic trunk prefix 0 is required before the area code. Therefore, a call from Hanoi to Ho Chi Minh City is dialed as 028 X XXX XXXX. Within Ho Chi Minh City, local calls can be made using the full 10-digit number (including the area code) due to the current closed numbering plan; the older practice of dialing only the eight-digit subscriber number is no longer valid. International callers must use the Vietnam country code and drop the trunk prefix: +84 28 X XXX XXXX. When dialing from a mobile phone, the plus sign (+) is typically used to denote the international access prefix, but in some countries, a specific exit code (e.g., 00) may replace it.

Overlay Considerations and Numbering Resources

Currently, no overlay area code has been introduced for Ho Chi Minh City; the 28 code remains the sole geographic NDC for the city. The numbering pool is managed to accommodate the high demand for fixed-line services, with eight-digit subscriber numbers providing up to 100 million theoretical combinations, though actual allocation is limited by technical and administrative constraints. As of 2025, no changes to the 28 area code are planned, but users should consult their service provider for any future dialing updates.