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Vietnam: SMS Features and Restrictions

Sender ID:

MobiFone Vietnam (45201)

  • This carrier blocks non-registered Alphanumeric Sender IDs and contents, Sender IDs on messages sent to MobiFone maybe changed automatically into a numeric string in the format of an International number to ensure delivery. 

Vinaphone Vietnam (45202)

  • Shortcode and local numbers (in both domestic and MSISDN formats) are not supported towards this network. SMS to Vinaphone will be changed to a generic sender ID including "NXSMS" or International format number to ensure delivery. 

Viettel Vietnam (45204)

  • This carrier blocks numeric Sender ID, shortcode and local numbers (in both domestic and MSISDN formats). Sender IDs on messages sent to Viettel may be changed automatically into alpha Sender ID including "Verify", or other form of generic Alpha Sender ID to ensure delivery.  

Importance note:

Vietnam operators are doing heavy filtering on non-registered Sender IDs and contents. Therefore SMS contents may be modified, with brand names being removed/modifying some special characters such as "code"/adding random characters at front of the message body etc, to bypass the filtering and ensure delivery. We strongly recommend to have your Sender ID & contents being registered to avoid any changes. 

Pre-registered Sender ID:

Please note we have an alternative and higher quality route towards Vietnam which ensure Sender ID and contents delivery but at a different rate than our default routing. This route allows to pre-register alpha Sender IDs and contents, however it does not guarantee Delivery Receipts to be returned. Please check with your account manager about this if you are interested in it.

Content:

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

Unicode:

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

Concatenated messages:

Concatenated messages are supported.

Other features/restrictions of note:

Delivery Receipts:

All Vietnam operators do not support handset Delivery Receipts. Some routes generate network 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 20 second interval would be classified as Spam. 

Virtual Numbers

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

Prefix update

There is a prefix change from 15 Sep 2018. From now till 15 Nov 2018, the old prefixes and the new prefixes can be used interchangeably. From 15 Nov 2018, the old prefixes will be disabled and only the new prefixes can be used to terminate into Vietnam. Please find the table below on the prefix changes: 

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

 

 

Links:

Global SMS Features Overview (Outbound only)

Global SMS Numbers Features Overview

 

 

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