Vietnam
Name

Vietnam

ISO Code

VN

Region

Asia

Mobile Country Code

452

Dialing code

+84

Major carriers

MobiFone, Gmobile, VinaPhone, Vietnamobile, Viettel

Guidelines for Vietnam
Two-way SMS supported

No

Number portability available

No

Twilio MMS support

Not Available

Sending SMS to landline numbers

You cannot send SMS to a landline destination number: the Twilio REST API will throw a 400 response with error code 21614, the message will not appear in the logs, and the account will not be charged.

Best practices

You may use a global SMS-capable number to reach mobile phones in Vietnam; however the Sender ID will be changed to a numeric string in international format to ensure delivery.

Not all Vietnamese carriers support Unicode characters. Customers have reported better results when using only the basic ASCII character set in Vietnam.

Twilio strongly encourages customers to review proposed use cases with qualified legal counsel to ensure they comply with all applicable laws. The following are some general best practices:

  1. Get opt-in consent from each end user before sending any communication to them, particular for marketing or other non-essential communications.
  2. Only communicate during an end user's daytime hours unless it is urgent.
  3. SMS campaigns should support HELP/STOP messages, and similar messages, in the end user's local language.
  4. Do not contact end users on do-not-call or do-not-disturb registries.
Phone Numbers and Sender ID
Preregistered
Operator network capability

Supported

Twilio supported

Supported

Sender ID format

Alphanumeric

Sender ID preserved

Supported

Two-way support

No

Provisioning time

1 week

Cost
--
Throughput (messages per second)

10 messages/second

Use case restrictions
--
Best practices
--
Alphanumeric
Operator network capability

Preregistered only

Twilio supported

Preregistered only

Sender ID format

Alphanumeric

Sender ID preserved

Preregistered only

Two-way support

Not supported

Provisioning time
--
Cost
--
Throughput (messages per second)
--
Use case restrictions
--
Best practices
--
Long Code
Operator network capability

Not Supported

Twilio supported

Overwritten

Sender ID format
--
Sender ID preserved
--
Two-way support
--
Provisioning time
--
Cost
--
Throughput (messages per second)
--
Use case restrictions
--
Best practices
--
Short Code
Operator network capability
--
Twilio supported
--
Sender ID format
--
Sender ID preserved
--
Two-way support
--
Provisioning time
--
Cost
--
Throughput (messages per second)
--
Use case restrictions
--
Best practices
--
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