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Vietnam SMS Features and Restrictions


Sender ID

All non-registered Sender IDs will be changed to a generic sender ID such as "NXSMS" or any international format number to ensure delivery.

SMS Content Filtering

Vietnam operators are doing heavy filtering on non-registered Sender IDs and contents. SMS contents may be modified, with brand names being removed or modifying some special characters such as "code," or adding random characters at front of the message body etc., in order to bypass the filtering and increase the delivery rate. For messages with OTP codes, it is also possible that the end users will receive a Text-to-Speech voice call delivering the OTP codes instead of receiving an SMS message. This is a feature to further improve the delivery rate and no extra charge will be incurred. We strongly recommend to have your Sender ID and contents registered to avoid any changes or delivery issues.

Pre-Registered Sender ID

We have an alternative and higher quality route towards Vietnam for notification and OTP messages, which ensures Sender ID and content delivery but at a different rate than our default routing. This route allows pre-registration of Alpha Sender IDs and contents, however it does not guarantee Delivery Receipts to be returned. Contact your account manager if you are interested in this option.

Content

Gambling related content is not allowed.

Contents promoting online games (or Apps) are subject to approval by operators.

There are no additional content restrictions beyond those in our Acceptable Use Policy.

Unicode

Unicode is supported. However, delivery of messages in Chinese characters is not guaranteed, especially for those towards MobiFone.

Concatenated Messages

Concatenated messages are supported.

Other Features or Restrictions

Delivery Receipts

Vietnam operators do not support handset Delivery Receipts. Some routes generate network Delivery Receipts and some don't provide any Delivery Receipt, therefore a 'positive DLR' does not necessarily mean the message was received on the handset.

Spam Recognition

Any messages sent with the same content to the same destination number within a 60 second interval is classified as Spam and the duplicated messages within the 60s time frame will be rejected by the operators.

Virtual Numbers

Our LVNs in Vietnam are not to be used for any outbound Application-to-Person messages.

Prefix Update

As of 15 November 2018, the old prefixes listed below were disabled. Only the new prefixes can be used to terminate into Vietnam.

Telco

Old number

New number

Vinaphone

123

83

124

84

125

85

127

81

129

82

Viettel  

162

32

163

33

164

34

165

35

166

36

167

37

168

38

169

39

Mobifone

120

70

121

79

122

77

126

76

128

78

Vietnamobile

188

58

186

56

Gtel

199

59

Additional Information

For more information, see the following articles:

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