Area Code 36 – Mobile Network

Overview of Vietnam's Mobile Prefix 36

In Vietnam, the prefix 36 is a non-geographic mobile network code, allocated under the national numbering plan administered by the Vietnam Telecommunications Authority (VNTA). It is used exclusively for mobile services and does not correspond to any specific city or province. Subscribers assigned numbers starting with +84 36 are part of the country's extensive mobile network, which serves both voice and data communications.

Technical Format and Dialing

Vietnamese mobile numbers are ten digits long when dialed domestically, including the leading '0'. The international format, following ITU-T E.164, is +84 36 X XXX XXX, where '84' is the country calling code for Vietnam, '36' is the mobile prefix, and the remaining seven digits (X) form the subscriber number. When calling from abroad, you must drop the leading '0' and use the plus sign or the international access code (e.g., 00 from many countries). For example, a Vietnamese mobile number might be written as 036 123 4567 domestically, and +84 36 123 4567 internationally.

Network Operators and Portability

The prefix 36 is primarily associated with Viettel Mobile, one of the largest mobile network operators in Vietnam. However, due to Mobile Number Portability (MNP) regulations, subscribers can retain their number when switching operators. Therefore, a number starting with 36 may not always be serviced by Viettel; it could be ported to another MNO or MVNO. This portability ensures that the prefix does not guarantee a specific carrier, but it remains a reliable indicator of a mobile service.

Usage and Services

Numbers with the 36 prefix support all standard mobile services, including voice calls, SMS, MMS, and high-speed mobile internet (4G/5G). They are used for personal and business communications alike. When sending SMS or MMS internationally, the message should be addressed to +84 36 X XXX XXX. For voice calls, international callers should use the same format. Domestic callers can simply dial the ten-digit number starting with 0 (e.g., 036 123 4567).

Regulatory and Billing Considerations

As a mobile prefix, 36 is non-geographic, meaning that calls to these numbers are not tied to a physical location. Billing for calls to 36 numbers follows standard mobile tariffs, which may vary depending on the caller's network and plan. For international callers, charges are typically higher than domestic rates, and some service providers may impose additional fees. It is always advisable to check with your carrier for specific rates.