Area Code 83 – Mobile Network
The phone area code for Mobile Network is 83 (international format +8483). Browse local exchange codes (NXX) and carrier assignments below.
Overview of Vietnam's +84 83 Mobile Prefix
The +84 83 numbering block is a non-geographic mobile prefix assigned within Vietnam's national numbering plan, as administered by the Authority of Telecommunications and Digital Infrastructure under the Ministry of Information and Communications. Unlike geographic area codes, which correspond to specific provinces or cities, the 83 prefix is allocated to mobile network operators (MNOs) and mobile virtual network operators (MVNOs) for nationwide service delivery. This means that a subscriber number beginning with 83 does not indicate a physical location; rather, it is associated with a specific carrier's network infrastructure.
In the international format, a Vietnamese mobile number using the 83 prefix is written as +84 83 XXX XXXX, where +84 is the country calling code for Vietnam, 83 is the mobile prefix, and the remaining eight digits constitute the subscriber number. When dialed domestically, the leading trunk prefix '0' is used, resulting in the format 083 XXX XXXX. This distinction is crucial for callers: international callers must drop the trunk '0' and use the +84 country code, while domestic callers retain the '0' when dialing within Vietnam.
The 83 prefix is part of a broader migration plan that saw many Vietnamese mobile numbers transition from 11 digits to 10 digits starting in September 2018. Subscribers originally assigned to 11-digit numbers beginning with 0123 were migrated to the 10-digit format by replacing the '012' with '08', thus creating the 83 prefix. For example, an old number 0123 456 7890 would become 083 456 7890. This change aligned Vietnam with the ITU-T E.164 recommendation, standardizing all mobile numbers to a uniform length of 10 digits.
From a technical standpoint, the 83 prefix is non-geographic, meaning it is not tied to any specific region. This allows subscribers to retain their numbers when moving across provinces, a key feature of mobile number portability (MNP), which was introduced in Vietnam in 2018. MNP enables users to switch carriers while keeping their existing number, including those with the 83 prefix, provided the new carrier supports the porting process. However, the prefix itself remains associated with the original allocating network, which can be identified through number portability databases.
For international callers, dialing a Vietnamese mobile number with the 83 prefix requires the following format: +84 83 XXX XXXX. For example, to call a subscriber with the number 083 123 4567 from abroad, one would dial +84 83 123 4567. It is essential to omit the leading '0' of the domestic format. Domestic callers within Vietnam should dial 083 123 4567, using the trunk prefix '0'. SMS and multimedia messaging to 83 numbers follow the same international routing rules, with the message addressed to +84 83 XXX XXXX.
In summary, the 83 prefix is a vital component of Vietnam's mobile telecommunications landscape, serving millions of subscribers across multiple networks. Its non-geographic nature, combined with the 10-digit format, ensures efficient routing and numbering resource management in accordance with national and international standards.