South Korea SMS Features and Restrictions


Vonage is using Adaptive Routing in South Korea through a selection of different high-quality suppliers.

Sender ID

Sender ID is not supported and will change to a random long number to ensure delivery.


Message Content

Every message will automatically have either of the following text added:

  • "[Web 발신]" - Means SMS sent from web
  • "[국제발신]" - Means SMS sent from abroad

Message Length

Message length is 140 bytes (140 characters in GSM-7 or 70 characters in Unicode), including the leading text (see Message Content above).

Concatenated Messages

Concatenated messages are not supported to KTF and LGU+ operators, as operators do not provide concatenated SMS service. Concatenated SMS will be received in parts for these operators. 

LMS is supported for SK Telecom operator only and concatenated messages will be received as a MMS. Vonage will bill those messages in the same way that SMS concatenation works in other destinations. (LMS length 2000 char GSM or 1000 Char UC supported.)

Illegal Content

Illegal content, especially gambling and adult-related content, is not allowed to all Korean networks.


Spamming or sending suspicious messages are not allowed. These are serious issues in South Korea and it may trigger suspending your account with investigation from local authorities.


Korean networks support character encoding EUC-KR, supporting Korean text and some of the traditional Chinese characters. Simplified Chinese characters are not supported.


Binary messages are not supported.

Other Features and Restrictions

Delivery Receipts

Delivery Receipts are provided, however, they are not handset-generated and only indicate that the network has received the message.

Additional Information

For more information, see the following articles:

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