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TRAI SMS Headers: S, P, G, T Explained [2025 Rules]
- India's Telecom Regulatory Authority (TRAI) is rolling out a new SMS identification system in 2025 designed to help mobile users quickly identify the type of SMS message they...
- Under the new rules, every SMS header must include a suffix indicating the message category.
- For example,an Airtel promotional message in Delhi might appear as "AD-Airtel-P," while an Axis Bank transaction alert could read "AX-Axis-T."
Understand India’s new SMS identification system, launched by TRAI in 2025, designed to protect you from SMS fraud and spam. This guide breaks down the new SMS suffix system, and explains what each letter—P, S, T, and G—means for your SMS message security. Learn how the SMS suffix system helps you identify the type of SMS message at a glance, allowing you to filter out unwanted communications and prioritize important alerts like OTPs. This is timely information, courtesy of News Directory 3, and will help you navigate India’s evolving telecommunications landscape. Discover what’s next in the fight against SMS-based scams and fraud.
Decoding India’s New SMS suffix System for Enhanced SMS Identification
Updated June 14,2025
India’s Telecom Regulatory Authority (TRAI) is rolling out a new SMS identification system in 2025 designed to help mobile users quickly identify the type of SMS message they receive. With more than 1.1 billion mobile subscribers in India, the SMS suffix system seeks to cut down on spam and fraud by adding a single letter to the end of each sender ID.
Under the new rules, every SMS header must include a suffix indicating the message category. The letters and their meanings are:
- P: Promotional messages, including ads and discounts.
- S: Service messages, such as updates and reminders.
- T: Transactional messages, like one-time passwords (OTPs) and bank alerts.
- G: Government-authorized messages, for official communications.
For example,an Airtel promotional message in Delhi might appear as “AD-Airtel-P,” while an Axis Bank transaction alert could read “AX-Axis-T.”
The TRAI hopes this classification system will allow users to quickly assess the nature of an SMS without opening it. This should help users filter spam, prioritize critically important notifications like OTPs, and avoid falling victim to scams disguised as legitimate communications.
Given the prevalence of scam messages in India, this system could significantly lower the risk of phishing and fraud. Mobile users are encouraged to pay attention to the suffix letter on every SMS they receive.
What’s next
As the system rolls out across India, mobile users should familiarize themselves with the new SMS suffixes to better protect themselves from unwanted spam and potentially fraudulent messages.The TRAI will likely monitor the system’s effectiveness and make adjustments as needed.