Thailand (TH)

Locale name

Thailand

ISO code
The International Organization for Standardization two character representation for the given locale.

TH

Region

Asia

Mobile country code
A three digit code associated with the given locale and used in conjunction with a Mobile Network Code to uniquely identify mobile networks.

520

Dialing code
The dialing prefix used to establish a call or send an SMS from one locale to the given locale.

+66

Two-way SMS supported
Whether Twilio supports two-way SMS in the given locale.

No

Number portability available
Whether number portability is available in the given locale.

Yes

Twilio concatenated message support
Concatenation refers to the capability of splitting a message that is too long to be sent in one SMS into smaller pieces and then joining the pieces at the receiving end so that the receiver sees the message as one. 

Yes*
For certain sender ID types this may not be supported. Where messages are split and rejoined may vary based on character encoding.

Message length
How many characters can be sent given a particular message encoding before the message will be split into concatenated segments.

160 Characters

Twilio MMS support
Multimedia Messaging Service (MMS) provides a standards-based means to send pictures and video to mobile phones.

Converted to SMS with embedded URL

Sending SMS to landline numbers
How Twilio handles an SMS message destined for landline telephone number.

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
Twilio strongly encourages customers to review proposed use cases with qualified legal counsel to make sure that they comply with all applicable laws. This table lists some general best practices.

Sender ID Compliance

Sender ID Registration is required in Thailand. Unregistered Sender IDs will be overwritten with a generic Alphanumeric Sender ID outside of the Twilio platform and delivery will be attempted on a best-effort basis only.

The enforcement of complete blocking of unregistered Sender IDs in Thailand is on October 06, 2025. Twilio highly recommends sending from a registered Alphanumeric Sender ID to avoid having your messages blocked.

Content Compliance Requirements for SMS Delivery to Thailand

If your SMS content carries a URL, kindly submit the Thailand URL Registration Form  to get the full-length URL registered/allowlisted in connection with your Sender ID to prevent delivery failure. Shortened URLs are considered prohibited content in Thailand and can not be registered/allowlisted. If you are a customer that requires additional support for this URL registration process, please contact senderid@twilio.com.

Thailand's telecom regulator has very strict regulations about the type of SMS content which can be sent to mobile subscribers. They may impose heavy fines and cut off connections if these rules are breached. Customers that send messages to Thailand must follow all applicable laws and regulations and must avoid sending firearms, gambling, adult content, money/loan, political, religious, controlled substance, cannabis, and alcohol related content. Customers in bank and financial services should not send messages containing URLs. In addition, authorities in Thailand apply URL criteria, which customers will need to follow to be compliant with local regulation/avoid the blocking of SMS containing URL. This criteria includes: (a) URLs must direct users to legitimate and verified destinations; (b) URLs must not lead to interactive platforms (such as direct download sites, or forms requiring user input); and (c) the purpose of the URL must be transparent and lawful.

Time Restrictions for Marketing and Promotional Messages

Sending marketing and promotional messages between 9PM to 9AM is prohibited.

Additional Phone Numbers and Sender ID Guidelines

AIS in Thailand has a feature that prevents subscribers from receiving SMS from non-Thai numbers. Customers can opt-out of this feature by dialing *137.

Twilio strongly encourages customers to review proposed use cases with qualified legal counsel to make sure that they comply with all applicable laws. The following are some general best practices:

1. Get opt-in consent from each end-user before sending any communication to them, particularly for marketing or other non-essential communications.

2. Only communicate during an end-user’s daytime hours unless it is urgent.

3. SMS campaigns should support HELP/STOP messages, and similar messages, in the end-user’s local language.

4. Do not contact end-users on do-not-call or do-not-disturb registries.

Operator network capability
Whether mobile operators in the given country support the feature.

Required

There is no segregation between International and Domestic Traffic

Not Supported

Twilio supported
Whether Twilio supports the feature for the given country.

Required
Learn more and register via the Console

Supported

Sender ID preserved
In some countries sender IDs for certain sender types are not preserved and are changed for compliance and/or deliverability reasons. In these countries mobile subscribers will see a different ‘from sender ID’ than the one sent by you.

Yes

No

Provisioning time
Provisioning is the process of getting the sender ID approved and registered with mobile networks (depending on country requirements). Provisioning time is how long this process takes in the given country.

2 weeks

N/A

UCS-2 support

Supported

Yes

Use case restrictions

Customers who intend to register and send loan related content must be able to provide a license from the Bank Of Thailand.

Sender ID Registration is required in Thailand. Sending messages via an Alphanumeric Sender ID which is not registered will result in best effort based delivery.

Best practices

Local network operators tend to deactivate Sender IDs which were registered in the past but are not used for a considerable period of time.

We suggest our clients to make sure that they keep sending traffic periodically to the specific destination once they register their Alpha Sender IDs. If the Sender ID is deactivated due to inactivity then the customer needs to reinitiate the registration procedure.

Twilio suggests using a pre-registered Alphanumeric Sender ID in Thailand.

Operator network capability
Whether mobile operators in the given country support the feature.

Supported

Not Supported

Not Supported

Twilio supported
Whether Twilio supports the feature for the given country.

Not Supported

Supported

Not Supported

Sender ID preserved
In some countries sender IDs for certain sender types are not preserved and are changed for compliance and/or deliverability reasons. In these countries mobile subscribers will see a different ‘from sender ID’ than the one sent by you.

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No

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Provisioning time
Provisioning is the process of getting the sender ID approved and registered with mobile networks (depending on country requirements). Provisioning time is how long this process takes in the given country.

N/A

N/A

N/A

UCS-2 support

N/A

N/A

N/A

Use case restrictions

National Broadcasting and Telecommunications Commission of Thailand (NBTC) requires URLs in all A2P message content to be registered. 

Delivery of messages submitted with Numeric Sender IDs is on a best-effort basis and will be overwritten with a random Numeric or Alphanumeric Sender IDs. Pre-registration of Alphanumeric Sender IDs is required.

N/A

Best practices

N/A

Twilio suggests using a pre-registered Alphanumeric Sender ID in Thailand

N/A