Thailand SMS Features and Restrictions Thailand SMS Features and Restrictions

Thailand SMS Features and Restrictions

Subrata Swain

Country Summary

Country Name Thailand
ISO TH
Country Code 66
Region Asia
MCC (Mobile country code) 520

Sender ID Guidelines

Alphanumeric Sender ID

Due to spam blocking, all alphanumeric sender IDs must be pre-registered*.

Unregistered senders will be overwritten on a best effort basis.
Numeric Sender ID Numeric sender IDs are not supported unless offered by Vonage's 2-way service.
Generic Sender ID Generic sender IDs such as INFO, SMS, NOTICE etc are prohibited.

*To initiate the Sender ID registration process, please check Global Sender ID Portal or contact your account manager or support

Use-Case & Content Guidelines

Content filtering

From 13 Feb 2025, URL in message content need to be submitted for whitelisting as part of the Sender ID registration process. Mobile operators in Thailand are required to submit the URL to the National Cyber Security Agency (NCSA) in Thailand. Please take note that this may cause additional delays to the lead time for Sender ID registration. It is advisable to avoid using URL in message content unless there is a need for it.

Shared URL shorteners (bit.ly, tinyurl) are not allowed.

Registered Sender IDs with contents that contain a URL will need to be re-registered when there is any change in the URL excluding the variable part. For example, if the URL was www.vonage.com/12345 but has changed to api.vonage.com/12345 or www.vnge.com/12345, then re-registration is required to whitelist the new URL.

From Nov 2025, mobile operators in Thailand will gradually start implement URL screening.

Messages containing URLs blacklisted by operators will not be delivered.

Messages containing other URLs (whitelist and non-whitelist) will be delivered, but an exclamation mark will be added in front of the sender ID (eg. !Vonage).
Line feed character ("/n") AIS does not support the line feed character
Marketing Traffic Before sending any marketing traffic, opt-in consent is required from handset users.

Additional Information

P2P traffic is prohibited.

No political, religious, racial, unsolicited promotion, adult, part time, gambling, fake loan, fake job or fake crypto content. The National Regulatory will disconnect any aggregator who is detected to send above content, and may enforce a penalty or imprisonment up to five years.

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

 

 

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