Locale Summary |
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Locale name |
Vietnam |
ISO code |
VN |
Region |
Asia |
Mobile country code |
452 |
Dialing code |
+84 |
Guidelines |
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Two-way SMS supported |
No |
Number portability available |
Yes |
Twilio concatenated message support |
Yes* |
Message length |
160 characters |
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. |
Compliance considerations |
Vietnam mobile operators require pre-registration of Alphanumeric Sender IDs and message templates. Numeric Sender IDs are overwritten with generic Alphanumeric Sender IDs outside Twilio’s platform. Quality is lower and delivery is on a best-effort basis because generic Alphanumeric Sender IDs are likely to be blocked or filtered by mobile operators. Twilio therefore recommends using pre-registered Alphanumeric Sender IDs and message templates only. Sending promotional traffic (non transactional) is not currently supported. Mobile operators prohibit sending virtual currency-related content. You must have a license from the State Bank of Vietnam to send finance-related content via Sender ID. Delivery reports are SMSC-acknowledgment only and are not guaranteed. Sending adult, gambling, charity or political content is prohibited.
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