Which network uses the 35 prefix in Vietnam?

The 35 prefix was originally assigned to Vietnamobile. However, due to mobile number portability, subscribers may have moved to other networks, so the prefix does not guarantee the current operator.

How do I call a Vietnamese number starting with 35 from abroad?

Dial your country's international access code (e.g., 00 or +), then Vietnam's country code 84, followed by the subscriber number without the leading 0. For example, +84 35 123 456 789.

What is the correct format for a 35 number in Vietnam?

Domestically, dial 0 followed by the 9-digit subscriber number (e.g., 035 123 456 789). Internationally, dial +84 35 123 456 789.

Are calls to 35 numbers more expensive?

Calls to 35 numbers are standard mobile calls. Pricing depends on your operator and plan, not on the prefix. There are no special charges for calling a 35 number.

Can I keep my 35 number if I switch operators?

Yes, Vietnam supports mobile number portability. You can switch to another operator and retain your 35 number, subject to your new operator's terms.

Area Code 35 (Vietnam) - Prefix Details & Exchanges

Vietnam Mobile Prefix 35: Network Allocation and Dialing Guide

The Vietnamese prefix 35 is a non-geographic mobile network code, meaning it is not tied to any specific province or city. Instead, it is allocated to mobile network operators (MNOs) and mobile virtual network operators (MVNOs) providing nationwide cellular services. Subscribers under the 35 prefix are part of Vietnam's 10-digit mobile numbering plan (excluding the leading country code), formatted as 0xx xxx xxxx domestically and +84 xx xxx xxxx internationally.

Originally, the 35 prefix was assigned to Vietnamobile, a major MNO offering GSM and 4G/5G services. However, due to number portability regulations, subscribers may have retained their 35 numbers even after switching to other networks. Therefore, the prefix does not guarantee the current operator; it only identifies the original allocation. For accurate routing, always verify via the national number portability database if needed.

Domestic Dialing Format

Within Vietnam, callers must dial the trunk prefix 0 before the 35 code. For example, to reach a Vietnamobile subscriber with the number 123 456 789, you would dial:

035 123 456 789 (full domestic format)

This applies to both landline and mobile calls. There is no need to include the country code when calling from within Vietnam.

International Dialing Format

From abroad, callers must replace the leading 0 with Vietnam's country code +84. The same number would be dialed as:

+84 35 123 456 789 (international format)

When storing the number in a mobile phone, it is recommended to use the international format (+84 35...) to ensure proper dialing both domestically and internationally.

Number Length and SMS Routing

All Vietnamese mobile numbers, including those under the 35 prefix, consist of 9 digits after the country code (or 10 digits including the leading 0). This structure is standardized under ITU-T E.164. For SMS, the same international format is used, and messages are routed based on the full number.

Mobile Portability Considerations

Vietnam implemented mobile number portability (MNP) in 2019. This means a subscriber can switch from Vietnamobile to another operator (e.g., Viettel, Vinaphone, Mobifone) and keep their 35 number. Consequently, the prefix does not indicate the current network. When dialing, the call is routed to the new operator via a central database. There are no additional charges for calling a ported number; it is treated as a standard mobile call.

Caller Instructions

For local callers: Always dial the full 10-digit number starting with 0. For international callers: Use +84 and omit the leading 0. Ensure you have the correct country code and number length to avoid misdialing.

Area Code 35 – Mobile Network