SINGAPORE SMS: Products and Compliance

Sender ID	Alpha, Alpha Numeric, Numeric
Dialing code	65
Major Carriers	SingTel, M1, StarHub, SIMBA
Message length	160 characters
Support for Concatenated message	Supported
Settup Time	3 Business Days
Support for Two Way SMS	Yes (Long Code and Short Code)
Country Regulations	All Sender IDs/Longcode/Shortcode must be whitelisted with SGNic Non-whitelisted Sender IDs/Longcode/Shortcode will be overwritten to Likely-SCAM
Country Restrictions	Unsolicited SMS or calls from unknown sources that are related to loans, financial assistance, adult content or online gambling/betting are prohibited.
Extra Information	Enabling of Sender ID/ Long Code/Short Code is required

Regulations

IMDA will be implementing the Full SMS Sender ID Registration starting from 31 January 2023. Under the Full SSIR Regime, organisations that wish to send SMS messages to Singapore mobile numbers must first register their alphanumeric Sender IDs. Only registered Sender IDs will reach Singapore users with effect from 31 January 2023. Find out more about the process by downloading our one-pager.
With effect from 31 January 2023, all Sender IDs that is not registered with the SSIR, Sender ID will be overwritten to "Likely-SCAM"
With effect from 2 January 2014, Organisations must check with the Do Not Call (DNC) Registry to ensure that the Singapore telephone numbers that they are sending telemarketing messages to are not listed in the Registry - https://www.dnc.gov.sg/index.html
Under the advertising rules, which took effect on 1 November 2011, licensed moneylenders are not permitted to advertise their services via SMS - https://rom.mlaw.gov.sg/files/Advertising-&-Marketing-Directions.pdf

Reference:

8x8 - IMDA To Implement Full SenderID Registration