Is two-way SMS supported in Singapore?

No, two-way SMS is not supported in Singapore.

Can I send multimedia messages (MMS) in Singapore?

No, MMS is converted to SMS with an embedded URL in Singapore.

What happens if I send an SMS to a landline number?

You cannot send SMS to landline numbers in Singapore. The Sent REST API will throw a 400 response, and the message will not be delivered.

What is the mobile country code for Singapore?

The mobile country code for Singapore is 525.

Is two-way SMS supported in Singapore?

No, two-way SMS is not supported in Singapore.

Can I send SMS messages to landline numbers in Singapore?

No, sending SMS messages to landline numbers in Singapore is not allowed and will result in a 400 error code.

What happens if I use a non-registered Sender ID in Singapore?

Non-registered Sender IDs will be overwritten with ‘Likely-SCAM’ from 30 January 2023.

Are concatenated SMS messages supported in Singapore?

Yes, concatenated messages are supported, but they may not work with certain sender ID types.

What is the maximum length for an SMS message in Singapore?

The maximum length for an SMS message in Singapore is 160 ASCII characters.

Is MMS supported in Singapore?

MMS is not fully supported in Singapore; MMS messages are converted to SMS with an embedded URL.

Do I need to register my Sender ID for SMS campaigns in Singapore?

Yes, you must register Alphanumeric, Shortcode, and Domestic Longcode Sender IDs with the Singapore Network Information Centre (SGNIC).

Are international longcode Sender IDs allowed in Singapore?

No, international longcode Sender IDs cannot be registered in Singapore.

What types of content are prohibited in SMS messages in Singapore?

Prohibited content includes firearms, gambling, adult material, money/loans, political or religious topics, controlled substances, cannabis, alcohol, and links to messaging apps like WhatsApp or LINE.

What are the best practices for SMS campaigns in Singapore?

Best practices include obtaining opt-in consent, respecting daytime hours, supporting HELP/STOP commands, and avoiding do-not-call registries.

What is the dialing code for Singapore?

The dialing code for Singapore is +65.

Why is it important to register a Sender ID in Singapore?

Registering a Sender ID is important to comply with regulations and avoid messages being marked as 'Likely-SCAM'.

Can I send SMS messages at any time of the day in Singapore?

It is best to limit SMS messages to daytime hours unless the message is urgent.

What should I do if my SMS campaign involves prohibited content?

Avoid including prohibited content in your SMS campaigns to comply with Singapore's regulations.

What happens if I send an SMS to a do-not-call number in Singapore?

You should avoid sending SMS to do-not-call numbers to comply with regulations and avoid penalties.

How can I ensure my SMS messages are compliant in Singapore?

Ensure compliance by registering your Sender ID, avoiding prohibited content, and following best practices such as obtaining opt-in consent.

What is the consequence of not complying with SMS regulations in Singapore?

Non-compliance can result in penalties and your messages being marked as 'Likely-SCAM'.

Where can I find more information about SMS regulations in Singapore?

You can find more information on the Singapore Network Information Centre (SGNIC) website.

Are there any specific commands I should support in my SMS campaigns in Singapore?

Yes, you should implement standard HELP/STOP commands in the recipient’s local language.

What is the significance of the Singapore SMS Sender ID Registry (SSIR)?

The SSIR is crucial for registering alphanumeric sender IDs in Singapore, ensuring compliance and preventing your messages from being flagged as 'Likely-SCAM'. Registration requires a one-time setup fee and an annual charge.

What encoding should I use for SMS messages in Singapore to maximize characters?

For basic Latin alphabet messages, use GSM-7 encoding to maximize the character count up to 160. For messages containing Chinese characters or special symbols, use UCS-2 encoding, which allows for up to 70 characters.

How often should I check phone numbers against the Do Not Call (DNC) registry in Singapore?

Organizations must check phone numbers against the DNC registry at least once every 30 days before sending marketing SMS messages to comply with the Personal Data Protection Act (PDPA).

What are the recommended sending hours for SMS messages in Singapore?

While there are no strict legal restrictions, it's recommended to send SMS messages between 9:00 AM and 9:00 PM Singapore Time (SGT) to respect recipients' time and avoid sending messages during public holidays, early mornings, or late nights.

What should I do if I need two-way SMS communication in Singapore?

Since two-way SMS is generally not supported through A2P channels in Singapore, businesses should consider alternative methods or dedicated solutions for interactive communication.

How does number portability affect SMS delivery in Singapore?

Number portability allows subscribers to keep their numbers when switching providers. While it doesn't drastically impact delivery, maintaining updated routing tables is important for optimal delivery.

What are the key compliance regulations for sending SMS in Singapore?

Key regulations include the Spam Control Act 2007 and the Personal Data Protection Act 2012 (PDPA), governed by the IMDA and PDPC. Compliance involves obtaining explicit consent, supporting opt-out commands, and checking against the DNC registry.

What is the process for registering an Alphanumeric Sender ID in Singapore?

Registering an Alphanumeric Sender ID requires mandatory registration with the Singapore SMS Sender ID Registry (SSIR). The process involves pre-registration with a 5-day processing time, a one-time setup fee of SGD 500, and an annual charge of SGD 200 per Sender ID.

What are some strategies for handling SMS API rate limits in Singapore?

To manage rate limits, implement queuing systems, use batch sending APIs, utilize exponential backoff for retries, and monitor throughput to adjust sending rates effectively.

What are the key parameters to consider when using Twilio for SMS in Singapore?

Key parameters include the `from` (registered alphanumeric sender ID or Twilio number), `to` (recipient number in E.164 format), and `body` (message content). Validation of the Singapore number format (+65) is also important.

Singapore SMS Guide

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